Fan favorite HUNK is back and gets his own chapter in the game which is like an updated version of The 4th Survivor. He also gets some very memorable lines in the game as well.
Richard Aiken was one from the original game is featured in a chapter as a NPC partner for one of Rebecca Chambers' segments and receives a little bit of a tragic background reasoning for joining S.T.A.R.S.
Rebecca and Billy Coen both get a go in the Resident Evil 0 scenario and the fans to this day desperately await the day they will come back in another title in the main storyline of the series.
Goddamned Bats: The leeches in Train Derailment, small spiders in Mansion Incident and the roaches in Raccoon's Destruction have the potential to be like this. However, only a small number of them actually attack, in which they cause no damage unless you leave them on, and can be removed with a simple swipe of the knife. It's mainly if you're overwhelmed by other enemies at the same time that they become annoying. Played straight with the crows.
Scrappy Mechanic: The player must replay certain levels and score an A rank in order to unlock the final level, adding an unnecessary layer of padding in the eyes of many. This was removed in The Darkside Chronicles.