Angel Batista would have to be considered Dexter's best friend.

He doesn't know about Dexter's killing habit, of course, but Angel is still the one guy Dexter can sort of talk to and bond with.

Angel's personal life is a bit of a mess: he's divorced from his wife and doesn't see his daughter very often. He also got way too involved with that nut job Lyla in season two.

Still, Angel seems to be a genuinely well-meaning, kind-hearted detective. In season three, he was promoted to Sergeant. On season four, he actually married LaGuerta.

Angel Batista Quotes

Masuka: He's got daddy's eyes.
Batista:... and your penis size.

Angel: You know, Pasquale is just caught in a cycle of reaction. She's not co-creating her own reality.
Dexter: You know those words don't actually mean anything, right?

Dexter Quotes

I put her in a short skirt, so we could see her panties when she's falling.

Masuka

There are no secrets in life, just hidden truths that lie beneath the surface.

Dexter Morgan