Okay, there are some comic book characters where it makes sense for them to have a sidekick. A dude like Captain America can get away with bringing a teenage kid in short pants with him into the middle of World War II because he's a living symbol of truth, justice and the American way. But who ever decided that Wolverine needed one?
Chris Claremont, that's who. Starting in 1989, he introduced the character of Jubilation Lee, a California mall brat who had the power to generate fireworks from her hands. Speaking in the most obnoxious Valley Girl dialect ever committed to the printed page, she jumped through a dimensional portal to the X-Men's base in Australia (don't ask) and saved Wolverine from... being crucified by a cyborg.
Comics! Anyways, she proceeded to pal around with Wolvie for many, many years. If you were a nigh-immortal Canadian who killed a bunch of people, would you really want to spend your time with somebody who had a cassingle of "More Than Words" by Extreme permanently lodged in their walkman? I think not.