so, rule 34 style here are some characters to look into to see if anyones made games of them, if what you're after is big booty lolis.
Miss Kobayashi's Dragon Maid
Midna from Zelda Twighlight Princess
Some takes on Breath of Wild in lewd art/games
Some fangames and art from FATE series, particularly Apochripha and Kinleid Liner, and beatrice from Zero
cringe though Shadbase may be, they tend to draw them hourglass big booty thicc
Hex Maniac from Pokemon
The Aloha girls from Pokemon on wide hips though usually not chubby
Genshin Impact stuff usually has thicc-er thighs and butts but are more slim/fit physique, particularly klee
lillith of darkstalkers can either be thicc or very slim pending artist
doughnut girl from monogatari can be drawn thiccer
Meru the succubus (famous red demon succubus loli)
anything overwatch related tho usually no lolis
theres more but thats probably a good start.
games wise, there's
(tested)
DandyBoy Adventures
Third Crisis (not loli per say but lots of thicc)
Confined with Goddess(not loli but fit thicc)
Monster Girl Island series
Fui's Forest
Melatonin Magiks series
Daggan (furry)
Just in Slime (same dev as daggan)
Black Rabbit Trainer
Size Me Up
Adventure Trainer
Jump Harem
Cartoon Harem
HoloLewd Manager
HOM factory
Genex Love
Neko Touch, Misty Fucks, Hilda's reward (count moxy games on these 3)
drain mansion
James Cabello Animations
Juicy Futa
Klee Prank Adventures
School of Love clubs
Chaos Kingdom
Champion of Realms
Scarlet Law
Scarlet Trainer
The Fixer
Heros harem guild
free use planet
total maidness and it's spinoffs
Elven Quest 1 & 2
Ero Trap Sweeper
Goblins play
Arcane Madness
Ravager
My Dystopian Robot Girlfriend
Horny craft
hole house
My Hentai Fantasy (rebecca)
Academy 34 (mostly not loli)
oh my waifu (not usually loli, kinda premium release)
Forest of Love ii (furry)
feline fantasy (lvl 6 "uhoh" furry)
MonCurse
Tales of Androgeny (trans, kinda not loli)
Learn the Heart
The Wind's Desciple
Yu Crossing Animals (furry)
Mentor Life
pokegirl paradise
lusting my religion
messy academy
cherry bunny demon hunter (furry)
(not tested, searched)
Thicc Hero
Lust Age series
Lewd Town Adventures
Heroine Quest
Future Fragments
halloween harem
Dogma
Fantasy Opposite (futa)
Devils Academy DxD
Waifu Slut School
Broken Dreams
Nemurimouto
Sorceress End
Heavy Hearts
Casino Cuties
School of Lust RPG
Hex (alpha release new?)
Alley Doggos
Isekai Brothel
Crossworlds
Doki Doki Triline quest
The Beautiful World
ecchi quest
Reboot Love series
So, I should probably end this here otherwise it will just go forever. Most of these aren't loli persay, more hebe, but all should feature some form of big bottom characters. Most of tested ones are pretty good otherwise wouldn't mention them, some of untested like Lust Age I have had my eye on a while but due to gig size have not been able to get and test due to poor net connection vs hours download times.
I know this is kinda a necro post, but thicc charas are a passion of mine and loli/shota versions even moreso.