User blog comment:Bubby08/Surviving this Hiatus/@comment-3579848-20121022203432/@comment-34954086-20121023001327

Well lets see,
 * Falcon his his pet bird actually considered sidekick or partner
 * X-23, Jubilee, think there were a couple other young girls from various x-generations to go under his wing: Ganted hoarded by Xavier, but so is Wolverine.
 * Black Knight had his Squire, who later turned into a villain (Bloodwraith i think)
 * Fury has Quake who functioned in a similar mentory sort of role to standard sidekicks I believe.
 * Iron Man has Rhodey and Pepper, both donning Suits.
 * Daredevil kinda has Elektra, more partner/rival, but they sort of come as a pair imo
 * Sif or Valkyrie maybe could count for Thor, thoguh really up against the God of Thunder, pretty much everyone is sidekick level
 * Hawkeye and Mockingbird, more partnership, Hawkeye was always bigger though.
 * Daredevil and Ronin/Echo(nm?) The chick that was deaf mute, perfect combo for a blind guy, all they need is someone dumb...I'm sure we can donate :P
 * Young Avengers sort of sidekick to Avengers, lets see New Mutants, Generation X, Young X-Men, Hope's Light, all the later generations/sidekick teams to standard X-Men.

There're a couple of sidekicks, just a different style compared to DC standard Mentor-Kid sidekick relationship, since most heroes are adults or part of team as well.