oh, someone else doing a rewatch! i still have to properly watch all of the mcu starting from iron man, but after rewatching infinity war and endgame- i fear i'm just going to end up a strange mix of bitter/emotional when i get up to those two again
in terms of the mcu, my favorite heroes are: pretty much all of the guardians of the galaxy (gamora and peter being my OTP in the entire universe

), spider-man (tom holland is such a cutie and is my favorite spider-man cinematic incarnation next to Miles), captain america, winter soldier, falcon, and black widow
villains: loki i guess- i don't find him but i do love his personality lol
outside of the mcu (but appeared in film- i've only read a few comics and really should read more): nightcrawler from the x-men, deadpool, and miles morales/spider-man