1. Chrom from Fire Emblem Awakening
2. Princess Zelda from The Legend of Zelda
3. Eliott from Stardew Valley
4. Dimitri from Fire Emblem Three Houses
5. Kirby
depends on how you view being "mature". if you mean making proper decisions for myself and taking decent care of myself, then yes I am. but if you mean what kinds of tv shows/movies I like, what my interests are, do I collect/play with toys, etc. then no not at all lol.
I watch mainly hockey, but occasionally watch baseball and less occasionally football/college football. I still consider myself a pretty big sports fan, though.
I don't really watch documentaries on my own time, but I saw some in college that were really fascinating to me. I always worry about watching documentaries that have a lot of bias in them so I'm just generally not very interested in seeking them out myself.