1. He is an ‘Anti-Hero’
2. He is White, Mutant, AND Canadian
3. His Tragic Backstory
4. His Strong Code of Ethics
5. He is Notably Lonely
Though Wolverine’s near immortality seems like an ideal trait, it has caused him to experience an immense amount of loss, which is perhaps what makes him feel most isolated from others in life. Wolverine-- a notable lone wolf-- continuously joins forces with other heroes because all he ever wanted was to fit in, a craving that everyone fights to feed at some point in their lives, and Wolverine has spent his whole life hungry.
Everyone feels like they are alone sometimes. If you claim that you do not then you are lying to yourself. It is an unavoidable pitfall of the human condition that, when shared amongst other lonely people, somehow makes us feel less alone.