He has multiple girls into him despite being awkward at time, he has high Cha.
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Yeah, he was a condescending sexist prick to the Kiyoshi warriors (initially), and while it did earn him some beatings, it didn't get him a restraining order and he even got with Suki in the end. That's high CHA alright.
I don't know about you, but to me, the fact that he showed genuine humility and willingness to step beyond his initial chauvinism (after some hands-on lessons about fighting women) had a lot more to do with that than his charm.
Meet enough people and there will be at least one who is into jerks.
Or maybe he's just hot.
Thus giving him high Cha
Charisma is force of personality. Being hot is just a circumstance modifier to some checks.
In Pathfinder 1e, it mentions that high charisma can mean an attractive person. We know this can be true because my bard had a 36 cha (PF1e is broken lmao) and we all know it wasn't his personality.
~~Yeah, but it affects ALL charisma rolls, so it's effectively just a permanent CHA boost applied directly to the character. No functional difference from naturally high CHA, IMO.~~
Wait.
It doesn't work if target doesn't have LOS, so loophole found, we just have to invent the internet or telephone in-universe to nullify sokka's advantage.
Edit: or drop a permanent orb of darkness over him so nobody can see what he looks like
Or maybe he just met a lot of people.
Trying to defend being a massive Sokka simp, I see?
Depending on the person, being awkward can be charming and sweet.
That's rough buddy.
We all praise Sokka, but let's not forget that the live action actress of the princess got a dick haircut, the ultimate bard haircut.