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I would say that along with his development and as he develops there are similarities and parallels between him and Yukino that become more apparent as he changes Yukino is slower to come around to the changes so it becomes a little clearer as time goes on in the show. And I thought that was kinda neat.
@TohkaTron
I am shamed by that favorite, thank you for reminding me to remove it
@crissoopshii
Mustang because he is a guanine badasss and a really good written character.
@BeElephant you sadly relate to him?

@tsukatsa
Hanako
You like everything about him ig
@R2R
Because she's cool

@KawaiiStardust
Because she's cute and hilarious~?
because he is very cool, and I would say more things but since you didn't read the manga I'm not going to say anything else xD
More 'cause he's kinda funny, but yeah~
Also I don't mind manga spoilers~ I've already read quite a few haha...~
...Though I don't remember probably reading about his backstory which may be what you're thinking of. Based of my reaction to Shinobu's backstory when I was rewatching s1... I feel like that'll definitely get tears flowing hahaa...~ Ah, I can't wait for s3~
@TohkaTron
Saitama: Because he is funny, interesting and really entertaining.