ImoenFriendship VS Black-Hearts-BG1

Minsc, Yoshimo, Valygar, Cernd, Imoen, Korgan, Mazzy, Viconia. Pair these with the Banter pack and IEP for even more chatter.

Minsc (note: lets you talk to Boo), Yoshimo, Valygar, Cernd, Imoen, Korgan (it's basically a pub crawl, it's great), Mazzy, Viconia, and Sarevok.

Friendship mods: Cernd, Valygar, Minsc, Imoen, Yoshimo, Korgan, Viconia, Haer’Dalis, and Mazzy. There’s one I haven’t linked here for spoiler reasons. Only click this if you don’t mind having a semi-hidden NPC spoiled: Sarevok friendship Also recommended are BG1 Neera Expansion (for BG1), Wilson Chronicles, and Wings, an Aerie friendship/banter mod.

Extended banter project - NPCs talk with each other more Banter pack - same thing. Some people find the level of chatter excessive, but if you're a completionist, it's easy to run out of dialogue Ascension - the original version was actually written by David Gaider. It's been totally recoded. I don't recommend installing the first component (rewritten chapter 10) because the fight is super tough, but the other stuff is good - longer epilogues, improved character interaction, etc. There are also a bunch of friendship mods that offer expanded non-romantic content. All quite well-written. I've played and liked: Valygar, Minsc, Imoen, Yoshimo, Viconia, Mazzy, Haer'Dalis, and Cernd.

Perhaps consider the Imoen Friendship mod: https://github.com/SpellholdStudios/ImoenFriendship

Black Hearts: adds a series of bounties, culminating in stopping a new ally for the final boss.

Great list! I especially second the rec for Black Hearts (for non-EET games, it also has a little ToB follow-up, installed via a separate download). It's an absolute delight, and really builds the character of Illasera, who is otherwise completely forgettable in the vanilla game.