I'm doing such a small database, so please do not even know about others that would fit into these.

Division of Thai lakorn

Thai lakorn is usually harsher than Korean, Japanese or Chinese drama. In Thai lakorn it is usually about revenge, arranged marriage, trespassing of bad characters (parents can no longer look, how they raised a child and find someone to re-educate) there are a lot of things I have included those I have already seen, but it is Much more.

I'm doing such a small database, so please do not even know about others that would fit into these.

 Revenge for killing your friend / girlfriend

Borisut Bumbut Kaen 

Ruk Ter Yord Ruk

Sanaeha Sunya Kaen 

 Jam Loey Rak 

Kleun Cheewit 

Sanaeha Sunya Kaen

  

Revenge for parents (either lost property due to someone or murder) 

Roy Lae Sanae Luang 

Pin Anong

More Sin Rai Fai Sawart 

Sawan Biang 

Likit Kammathep

Roy Leh Sanae Rai  

Revenge for siblings

Wong Wien Hua Jai

Hatred between families

Duang Jai Akkanee

Fai Nai Wayu

Ruk Pathiharn 

Raeng Tawan

Hatred between business and business Lakorn

Pathapee Leh Ruk

Lakorn where the main heroine was sent (to serve, take care of someone) instead of someone else and then was bullied from the opposite sex to whom she then fell in love

Ngao Asoke 

Majurat See Nam Pueng

Lakorn on the exchange of twins

South Sai Pan

Ngao Jai

Lom Sorn Ruk

Lakorn with the theme of the mafia

Mafia Luerd Mungkorn

Series One: "Suer"

Series Two: "Singh" 

Series Three: "Krating" 

Series Four: "Raed" 

Series Five: "Hong" 

Cubic

Karn La Krang Neung ... Nai Hua Jai 

Mafia Tee Ruk 

Roy Ruk Hak Liam Tawan 

Roy Fun Tawan Duerd 

Yok Luerd Mungkorn

Nang Fah Kap Mafia 

Lueat Tat Lueat

Lakorn with the theme of bodyguard

Suparb Burut Satan

Bodyguard Sao 

Nang Rai Tee Rak 

Sapai Sai Lub

Lakorn with an agreed marriage / marriage / to play with the spouse

Leh Ratree 

Padiwaradda 

Raeng Pradtanaha 

Roy Marn 

Ton Ruk Rim Rua

Mia taeng

Pai Chai Khon Neo Mai Chai Poo Wised (2016) 

Jao Sao Rim Tang 

Kha Khong Khon 

Badarn Jai 

Likit Kammathep (with son revenge)

Dao Kiang Duen

Stupid Cupid 

Mia Tuean

Lakorn when a brother / sister has to enter into marriage, for siblings (either to repay the debt or the child.)

Wanida

Unrecognizable son / daughter

Kularb Rai Kong Naai Tawan

Agricultural lacquers are mostly focused on the struggle for land, forests

Tarm Ruk Keun Jai 

Torranee Nee Krai Krong

Lakorn about gender change either the main character he / she turns out to be a boy / woman or hides identity. 

Dok Ruk Rim Tang

Lakorn about hiding true identity, people, title for gaining (education, love, shelter from problems)

Thara Himalai

Panyachon Kon

Kol Ruk Luang Jai

Lakorn with food or culinary

Wan Jai Gub Nai Jom Ying 

Soot Sanae Ha

Lakorn of supernatural beings

A jealous spirit (ex which is dead hinders the relationship) 

Koom Nang Kruan

Wayupak Montra 

Wiang Roy Dao

Exchanged souls for another body

Porn Prom Onlaweng 

Hua Jai Mee Ngao

The spirit that helps the principal (solve cases or protects the person)

Raak Boon

Raak Boon 2 

Pope Rak

Yai Kanlaya 

Mor Phee Cyber

Curse (due to bad behavior)

Leh Nangfah

Lakorn about time travel

Tawipob

Lakorn about vampires   

Ruk Mai Mee Wun Tay

Roommates (a contract for a common home for getting something (house, money, etc.))

Full House

Lakorn about actors involved in case investigation (mostly fun)

Nang Rai Sai Lab 

Fantasy / mysterious 

Patiharn Ruk Karm Kob Fah 

Song Huajai Nee Puea Tur

  Lakorn where the main hero / heroine suffers from a handicap, but it does not prevent it in the way of love 

Kaew Tah Pee 

Ruk Nai Marn Mek

Historical 

Nung Nai Sueng Kehas See Dang Fah Jarod

Sai Kaen Sanaeha 

Koo Gum 

Look Tard 

Lah Ruk Sut Kob Fah

Neung Nai Suang 

Mongkut Saeng Jun 

Sapai Jao

Family / Romantic

Hua Jai Rua Puang 

365 Wun Haeng Rak 

Nai Suan Kwan 

Ab Ruk Online 

Kaew Ta Waan 

Jai Jad Ruk Viva Luang 

Kiss me

Military / police with romance

Phu Khong Yod Rak

Fang Nam Jarod Fang Fah 

Roi Pa Wai Duay Rak

Action / thriller with a touch of romance

Rahut Torachon

Lakorn serial series

The Gentlemen of Jutathep (2013) 

Khun Chai Taratorn (Part 1) 

Khun Chai Pawornruj (Part 2) 

Khun Chai Puttipat (Part 3) 

Khun Chai Rachanon (Part 4) 

Khun Chai Ronapee (Part 5)

4 Hearts of the Mountains 

Thara's Himalai (Thara's Himalaya) part1 

Duang Jai Akkanee (AkkanPathapee's Heart) part2 

Pathapee Leh Ruk (Pathapee's Love Trick) part3

Wayupak Montra (Wayupak's Enchantment) part4

The Three Musketeers Series

Series 1: Maya Tawan

Series 2: Mon Jan Tra 

Series 3: Fah Krajang Dao 

Some corrections:
Jam Loey Rak ---- revenge for killing a sibling (his brother) ...NOT friend   ..... Also mistaken identity, or paying the price on behalf of sibling.
Sawan Biang --- revenge on both sisters, because his old nemesis (sister) married his father ..... NOT revenge on behalf of his father/parent.
...................... --- also, revenge from the sister on her old nemesis (male lead) for his past mistreatment 
........................ --- either way, she is paying for revenge on her sister, and for revenge by her sister.

Also,
I am getting confused searching your list to check if you already have it, then searching for appropriate category, then getting confused b/w overlapping categories ....
So, I'll just list them below and you can add them to ur DB any way u like :)


examples: 
====> Revenge for death of  family members or loved ones (fiancee, friend)
-- Buang Ruk Gammatep  ---  Death of his brother  
-- Fai Luang --- revenge on his father's
-- Game Payabaht -- His sister commits suicide, he blames her brother.
-- Jam Loey Rak --- death of hero's brother, due to heroine (mistaken identity)
-- Kleun Cheewit --- death of his fiancee 
-- Mai Sin Rai Fai Sawart  --- suicide of his father .... suicide of her father 
-- Nangfah Gub Satan ---  rape and death of his mother
-- Proong Nee Gor Ruk Ter --- his sister kills her sister
-- Reang Ngao (2001) --- suicide of her sister 
-- Roy Lae Sanae Luang --- rape and death of his mother 
-- Roy Ruk Raeng Kaen --- death of his sister, he believes her brother is the cause.
-- Sanaeha Sunya Kaen  --- death of hero's fiancee by heroine
====> Revenge for hurting a family members or loved ones (fiancee, friend)  
-- Buang Rak Salak Kaen  --- revenge for his mother 
-- Jao Sao Prissana ---  revenge for  her sister
-- Jone Plone Jai --- kidnap her away from his brother 
-- Fire Series: Fai Ruk Game Rorn --- revenge on him for being the mistress' son 
-- Fire Series 2: Talay Fai ---  revenge for being his father's mistress , on behalf of his mother 
-- Likit Kammathep --- revenge for marrying his father (mistaken identities)
-- Samee (2000)  --- for being arrogant and insulting his father & brother 
-- Sapai Glai Peun Tiang ---  revenge for  her sister
-- Tangpan Gammathep --- revenge for marrying his father (but he has mistaken their identities)
-- Wong Wien Hua Jai ---  for his sister's sake 

====> Revenge by female lead
-- Buang Ruk Gammatep --- she took offensive b/c he started it!
-- Fire Series: Fai Ruk Game Rorn -- for hiding birth secrets and mother's affair.
-- Jao Sao Prissana ---  revenge for  her sister
-- Kon Rak Game Payabaht  ---  used him as tool for revenge for  her sister
-- Reang Ngao (2001) --- revenge for  her sister
-- Sapai Glai Peun Tiang --  revenge for  her sister

====> Revenge from Past lovers (for breaking one's heart by betrayal or lying) 
-- Fire Series: Fai Ruk Game Rorn 
-- Game Rai Game Rak
-- Jai Rao 
-- Mafia Luerd Mungkorn: Krating 
-- Ngao Hua Jai 
-- Proong Nee Gor Ruk Ter   
-- Roy Ruk Raeng Kaen 
-- Sai Roong 
-- Sud Sai Pan
-- Yah Leum Chan

====> Revenge for other reasons    
-- Ching Chang --- 2nd Male lead wants revenge for lead stealing his fiancee
-- Muean Khon La Fark Fah (1995) --- revenge for being gold-digger like her mother who married his father.
-- Nung Nai Sueng (2005) and (2015) --- to get back at childhood enmity... and arrogance and pride 
-- Roy Leh Sanae Rai (2002) and (2015) --- for greed 
-- Samee (2000)  --- for being arrogant and insulting his father & brother
-- Sawan Biang ---  revenge b/c of her sister
-- Tawan Tor Saeng  --- he wants revenge on his mother

====> Family Feud and/or historical enemies ....
-- Buang Rak Salak Kaen  --- multi-generational
-- Buang Ruk Gammatep 
-- Duang Jai Akkanee
-- Koo Gum  ---  Thai vs. Japanese, during wartime 
-- Mafia Luerd Mungkorn: Suer
-- Muean Khon La Fark Fah (2017) --- his grandmother hates her and her mother.
-- Samee (2000) --- different ethnicity / class
 
====> Forced/arranged Marriage (due to debt, past promises, etc) ... Fake marriage .... forced mistress 
-- Bang Rajan --- He kidnapped her, so forced to marry.
-- Cubic  --- sold to him to pay off father's Debt ... He wants older sister (as mistress) , they were switched (she's Not mistress)
-- Full House Thai  ---  forced habitation due to Debt 
-- Kon La Kop Fah  ---  he buys her as fake wife
-- Kon Rak Game Payabaht  ---  she tricked him into marrying her as a tool for revenge
-- Koo Gum  ---  Forced marriage, for her reputation, as a political strategy by the generals, to better Thai-Japanese relations.
-- Leh Ratree  ---  marriage to pay off family Debt 
-- Mafia Tee Ruk  ---  sold to him, as mistress, to pay off father's Debt
-- Mai Sin Rai Fai Sawart   ---  forced  to be his mistress ...  (she still had choice tho) .... (Debt/house)
-- Majurat See Nam Pueng  ---  past promise 
-- Mam Gaem Daeng  ---  fake marriage to his brother 
-- Manee Yard Fah  ---  Forced to marry as a cover, so he can be her bodyguard
-- Nangfah Gub Satan  ---  she is forced to marry to pay off family Debt
-- Nung Nai Sueng (2005) and (2015)  ---  forced engagement 
-- Oum Ruk  ---  forced marriage due to pregnancy 
-- Piang Chai Khon Nee Mai Chai Poo Wised  ---  Temporary forced marriage due to his Debt .... (Debt/house)
-- Pin Anong 
-- Roy Lae Sanae Luang ---  she is forced to marry to pay off family Debt 
-- Samee (2000) --- forced to marry son as revenge ... He (pretends to be *wink* lol) forced to marry in place of his brother...(Debt/house) 
-- Samee (2013)  ---  forced to marry for owing money  .... (Debt/house)
-- Samee Ngern Phon (2001) ---  Temporary forced marriage due to his Debt  .... (Debt/house) 
-- Sapai Glai Peun Tiang  --- she forces him to marry her
-- Wanida ---  He is forced to marry in place of his brother
-- Wong Wien Hua Jai --- he forces her to marry him, in order to get her away from her ex, who is now his sister's husband.

====> Mistaken Identities .... Hidden Identities .... Birth Secrets/ baby exchanges ....
-- Bang Rajan --- Jai's secret  ---  (Hidden Identities)
-- Buang Rak Salak Kaen ---   (Birth secrets)  
-- Ching Chang ---  (Birth Secrets) 
-- Hua Jai Rua Puang ---  she's not real mother, 2nd lead is 
-- Jam Loey Rak ---   Mistaken identity of heroine 
-- Jam Luey Gamathep ---  Mistaken identity 
-- Karn La Krang Neung…Nai Hua Jai ---  Doppelganger 
-- Kol Ruk Luang Jai ---  she pretends to be a prostitute he hires   (Hidden Identity) 
-- Likit Kammathep ---  Mistaken identity, he thinks she's after hid dad's money
-- Luk Mai Klai Ton (2000) ---  Birth secret
-- Mafia Luerd Mungkorn: Krating ---  Both he and she  assume new identities   (Hidden Identities) 
-- Mam Gaem Daeng ---  He thinks she's his brother's wife
-- Manee Yard Fah  ---   She's a princess in hiding, he's her bodyguard  (Hidden Identity)
-- Ngao Asoke (1999) and (2008) ---  she assumes identity of his fiancee  (Hidden Identity) 
-- Ngao Hua Jai ---  she assumes new identity  (Hidden Identity)
-- Ngao Kammathep ---  switched at birth, gender bender   (Birth secrets and Hidden Identity)
-- Panyachon Kon Krua ---  she's undercover   (Hidden Identity)
-- Sai Lub Rak Puan ---  he's a secret agent   (Hidden Identity)
-- Sai Roong ---  he assumes new identity   (Hidden Identity)
-- Sapai Glai Peun Tiang ---  she mistakes hero for his brother
-- Tawan Tor Saeng  ---   He hides his true identity 
-- Thara Himalaya ---  He hides his true identity
-- Wimarn Sai ---  He thinks she's his brother's wife 

====>Twin Exchanges .... Twin Mistaken/Hidden Identities .... Doppelganger
-- Bundai Dok Ruk---  just twins   (Twins)
-- Karn La Krang Neung…Nai Hua Jai ---  Doppelganger
-- Ngao jai --- brothers Twins, taking the other's place   (Twin, Hidden Identities)
-- Reang Ngao (2001) ---  sister Twins, taking the other's place   (Twin, Hidden Identities)
-- Sud Sai Pan ---  mistaken identity and twin exchanges   (Twin Exchange)

====> Bride / Groom  Switching .... mistress
-- Cubic ---   Daughters switched ... Oldest sold as his mistress, but switched w/ youngest 
-- Jao Sao Prissana ---  brides switched 
-- Samee (2000) --- Groom changed 
-- Sud Sai Pan --- He doesn't know bride is her sister
-- Wanida --- Groom changed

====> Child w/ one of the leads (biological or adoptive)
-- Buang Ruk Gammatep --- her sister's
-- Hua Jai Rua Puang  --- her niece's 
-- Ngao Hua Jai --- her brother's 
-- Wimarn Sai --- his, but he thinks it's his brother's

====> Siblings in love w/  (or fighting for) same person ... or lead loves siblings
-- Bang Rajan ---  sisters love the same man 
-- Ching Chang ---  3 of 4 sisters fighting over 2 men
-- Cubic  ---  he wants oldest sister as his mistress, sisters were switched, so he falls for younger sister.
-- Jone Plone Jai ---  takes her away from his brother 
-- Luk Mai Klai Ton (2000) ---  both sisters love him ... both brothers love her
-- Mam Gaem Daeng ---  He thinks she's his brother's wife 
-- Ngao Hua Jai ---  both brothers like her.
-- Sud Sai Pan ---   both sisters are in relationship w/ him
-- Wimarn Sai ---  He thinks she's his brother's girl

-- Game Rai Game Rak - secondary story
-- Samee (2000) - secondary story

====> Amnesia (for MC) 
-- Ching Chang
-- Game Rai Game Rak
-- Sawan Saang

====> Major Illness or Disability  in lead character 
-- Duang Jai Patiharn --- Heart disease
-- Jai Rao
-- Kaew Tah Pee --- blindness

====>  Gender Bender 
-- Khun Chai Taratorn -- he knows she's disguised as a man
-- Ngao Kammathep -- part way 
-- Sompong Nong Somchai 
-- Taddao Bussaya

====> Supernatural / fantasy ... Ghosts .... spirit takes over body .... spirit exchanges ... other 
-- Jao Ban Jao Ruen 
-- Leh Nangfah --- curse makes her a bird by night
-- Qi Pao 
-- Song Huajai Nee Puea Tur 
-- Tae Pang Korn

====> Vampires
-- Ruk Mai Mee Wun Tay 

====> Time travel 
-- Buang Banjathorn
-- Tawipob

====> Fairy Tale ... royalty
-- Dung Duang Haruetai  (1996) and (2008)
-- Fah Jarod Sai
-- Manee Yard Fah
 

More later

Continued...

====> Action ... police/detective/crime / spies / gangs  ....  (Not Mafia main lead)
-- Bang Rajan --- historical, war
-- Cheewit Puer Kah Hua Jai Puer Tur (1998) (2017)
-- Din Nam Lom Fai
-- Love Mission / Paragit Ruk Series:  1 thru 4
-- Petch Tud Petch
-- Prao 
-- Sai Lub Rak Puan --- spies under cover 
-- Tawun Thud Burapah (1999) (2015) 

====> Mafia  (main or second lead) ....  (usually Action genre) 
-- Cubic
-- Karn La Krang Neung…Nai Hua Jai
-- Mafia Luerd Mungkorn Series --- 1 thru 5  (Suer, Sing, Krating, Raed, Hong) 
-- Mafia Tee Ruk 
-- Mon Jun Tra  --- he's legit casino owner, but deals w/ mob
-- Morrasoom Sawat  
-- Nang Fah Gub Mafia 
-- Ploy Lorm Phet  ---  they are chased by Mafia boss, the second lead's father
-- Rising Sun Series 1: Roy Ruk Hak Liam Tawan 
-- Rising Sun Series 2: Roy Fun Tawan Duerd

====> Historical / Period ... 
-- Bang Rajan / Bang Rajun --- (1763 Ayuthaya Kingdom)
-- Ching Chang --- (1949-1969)
-- Ka Badin 
-- Koo Gum  --- (1940's WWII)
-- Look Tard 
-- Mongkut Saeng Jun 
-- Nung Nai Sueng (2005) and (2015) --- (1950's) 

====>  Kick-ass female lead  or exceptionally smart/strong/feisty
-- Ab Ruk Online --- Anne T. 
-- Bow See Chompoo 
-- Buang Ruk Gammatep  --- Kick-ass female  --- Bee N. 
-- Dung Duang Haruetai 
-- Fire Series: Fai Ruk Game Rorn 
-- Jao Sao Prissana  --- Kick-ass female --- Anne T.  
-- Kon Rak Game Payabaht  --- Kob 
-- Luk Mai Klai Ton (2000)  --- Kob 
-- Mai Sin Rai Fai Sawart  --- Kick-ass female  --- Kwan 
-- Reang Ngao (2001) --- Anne T.  
-- Rising Series 2: Roy Fun Tawan Duerd  --- Kick-ass female  --- Yaya 
-- Sai Roong  --- Anne T. 
-- Samee (2000) 
-- Sapai Glai Peun Tiang  --- Kick-ass female  --- Anne T. 
-- Sawan Biang  --- Anne T. 
-- Wimarn Sai --- Bee N. 

====>  Social commentary  ..... Family dramas .... land disputes .... business / law ... Psychology .... Realism
-- Ching Chang --- Family makjang
-- Kon La Kop Fah --- Realistic approach to behavioral psychology : anger management, alcoholism, depression, personal responsibility, etc...
-- Luk Mai Klai Ton (2000) ---  Selfishness and Love vs. responsibility 
-- Reang Ngao (2001)  --- changing society , female roles
-- Roy Ruk Raeng Kaen --- high price for revenge .. realistic court dealings
-- Samee (2000) --- Thai blood purity vs. Chinese culture... arrogance vs. pride
-- Sawan Biang --- psychological/environmental influences shaping behavior and personality


====> Series
-- 3 Musketeers Series --- 1 thru 3 
-- 4 Hearts of the Mountains  --- 1 thru 4
-- Cupid Series  --- 1 thru 7
-- Fire Series --- 1 and 2
-- Gentleman of Jutathep Series (aka Khun Chai Series) --- 1 thru 5 
-- Love Mission / Paragit Ruk Series:  1 thru 4
-- Mafia Luerd Mungkorn Series --- 1 thru 5
-- Rising Sun Series --- 1 and 2
-- U-Prince Series  --- 1 thru 11

More later

@Rainruma some listing you've got that!!!

@nejtik & @rainruma  im very thankful for this  detailed list....