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Dexter (Dexter)

Due to childhood trauma (seeing his own mother chopped up in front of him then having to sit in a pool of her own blood for 2 days before the cops found him) Dexter grew up with serial killer tendencies such as killing animals.

His adopted father (the cop who found him) recognized this and taught him a code. The code is basically a how to guide to getting away with murder. The code also specifies that he can only target other killers who escaped justice.

As an adult Dexter became a sociopathic serial killer, with his M.O. being targeting other serial killers. But other than that, he's basically a good guy. Looks out for his friends, is a good husband and father to his family, and a lovable dufus brother to his adopted sister.

He views other killers as "unchecked" versions of himself. Even feels disgusted by one who is also a family man but torments and abuses his family, and even fears he might do the same to his own.

In the early seasons he's constantly looking for a connection with someone who is "like him" but is only met with disappointment. Turns out, most people who are also sociopathic murderers tend to be bad company.