Honkai: Star Rail: Buu's Hatchling Is Spoiled by March 7th

[Honkai: Star Rail + adorable, doted-on mascot + Majin Buu + transformation beam + everyone gets a happy ending + lighthearted and invincible + no protagonist suffering]

After transmigrating into Honkai: Star Rail, Buu discovers that he has become a tiny Majin Buu, pink, round, and with a little antenna on his head!

The good news: he has an endlessly regenerating body and can fire a transformation beam that turns anything into chocolate and cookies!

The bad news: he's only as big as a throw pillow, has to eat eighty servings of dessert a day, and starts smoking and throwing a tantrum whenever he's hungry!

Even better news: when he was nearly starving to death on the snowy plains of Jarilo, March 7th and Himeko from the Astral Express found him and brought him aboard!

March 7th: "Wow! This pink mochi ball is so soft and bouncy! Quick, bring out that starry mousse Himeko's been saving and feed it to him!"

Welt: "Wait, did he just turn a Voidranger from the Antimatter Legion... into popping candy and eat it?!"

Dan Heng: "...Don't let him near the archive. The way he's looking at the archives is like he's seeing a mille-feuille."

When Lord Ravager Phantylia descends, intent on destroying the Xianzhou--

The little pink ball flicks his antenna: "Buu hates mean ladies! I'll turn you into a strawberry cream puff and eat you!"