Wolverine.
Really what else needs to be said.
With a new film centered around his famous journey to Japan, we’ve got 5 other recommendations (some classic, some new) if you’d like to read more about this mutant Canuck.
Interested in reading Wolverine’s saga chronologically? Here’s a great article that can get you started on that daunting task.
Collecting Wolverine
5 Wolverine Books You Should Read
BTW these are available at the SLCPL, along with many more, in the graphic novel section under Graphic Novel Wolverine & Graphic Novel X-Men.