Formerly a private data pack I made just for fun, now grown out to an entire multifunctional datapack. But still revolving around the same guy: Henri.
Henri's datapack
started out as a joke. This sketchy villager who would sell you impossible-to-craft potions. He still does that, but he now also enhances how tamed animals work, he can start a chat with you, is customisable through a settings menu.

Starting from v5.0.0, this datapack also contains one of Henri's friends: Bert The Banker. Bert allows for users to put their emeralds in his bank.

TL;DR: Henri is an amazing guy. This datapack is even better.