If there was a section about likability/personality he would score a solid 0/10 other than that as much as he's a fucking scumbag he hides it around other people and wears a mask of charisma to trick people, like what he did to Lena, she figured him out but if you play with her on his route, you learn that he's got her submissive side by the balls and she is drawn to it, exited by it.He's not just "good looking", he's another level good looking. Jeremy and Mike pursue girls, girls pursue Axel. That's what EvaKiss mean when she says he looks like a movie star and get's what he wants handed to him on a silver platter. That's charisma. You are comparing Fiats to Ferraris.
She's not with him because of any of his charisma per say, but because of his domineering sexual personality that she's got the hots for, i'm sure the charisma drew her in at first, but to those who know the real Axel his charisma score would probably be 0.
But that's not how the stats are messured.