All I want is a chatty MC that’s a guy. Anything goes BL, action, horror, and etc. He can be an idiot or a genius, I don’t care. Lay ‘em on me boys! I’ll take anything you give me... maybe not anything but I’m pretty open.
Chen Yue Zhi Yao Comedy/Mystery in which the Dialogue stands out: particularly due to the MC having a literal cursed verbiage. There is a more than normal amount of conversation (no reputation of a character being chatty though)
https://www.royalroad.com/fiction/26294/he-who-fights-with-monsters - banter with friends, smack talk with opponents, runs his mouth with (modern) references that makes no sense to those around him
Check out He Who Fights With Monsters over on Scribble Hub. Guy won't shut up. Edit - I see I'm not the only one who thinks so!
It's super good One of novels with true conclusive ending. With a peaceful polygamy and familial interaction with the children
For chatty, I assume you mean he like to insert himself a lot. Need To Propose to Seven Men What to Do? It's a danmei/BL story; our protagonist is tackling human relationships and the story would be full of dog-blood if it wasn't for his commentary. Warnings again that it should be read with discretion for it's mature content. Otherwise... Number One Lazy Merchant of the Beast World; the characters personality greatly affects the plot and his thought are loud and playful The Villain’s White Lotus Halo; this protagonist is like the one from "Need...Seven Men" when he undergoes human relations. The Film Emperor’s Daily Live Cooking Broadcast; our protagonist play it solo at first but his colorful commentary is excellent All recommendations above are BL and have a play-by-play view from our Male MC's Endo and Kobayashi’s Live Commentary on the Villainess; their is just a lot to say. But this is my most sincere recommendation.
Here's a interesting new story with an MC who tends to ramble on in a stream-of-conciousness way that's pretty amusing. https://www.royalroad.com/fiction/31096/dungeon-pearl