Why do you play as your main?

So I have been wondering, what makes people play as the character that they main?

For example, I like to play as Willow because I like the feeling of having a 2000 health bodyguard following me around, and it's fun to be able to drop Ashley and have her take care of any monsters.

So what do you find fun or why do you play as the character(s) you play.

(Im only really talking about actual characters, no modded characters, also please don't just say "cause it's part of the meta")