Thank you very much! ♡
1. The black-haired guy is [REDACTED], Ren's real self! They are part of the game — however you won't officially "meet" [REDACTED] until Day 7.
2. I'm not familiar with DDLC or its Fan Pack, but from what I can gather, no, 14DWY doesn't have anything like that. But many folks in the community often make fan merch for the game, and I also post official art and stuff on Discord, Twitter, and Tumblr ^^