>>2568477>Diana was already rounded in the first season.
No. She was basically Andrew without being nearly bankrupt and defeatist attitude. In fact, Andrew served more of a foil to Akko than Diana ever was. Akko considered (and still considers) Diana as a rival, but such rivalry was barely shown, despite actually existing. >Her acting a bit narcissistic, like when she literally waited to listen to the teachers clap after she initially defused the fairy strike?
A bit, but that’s her just simply trying to defuse the strike. Ironically, that episode showed Akko properly getting into her nerves, so it gets a pass but not for the reasons you stated. OVA Diana shows off more and is more narcissistic.>Her being competitive despite pretending to be above competition, like episodes 3 and 13?
Ep.3 and that's it. In ep. 13 was trying to emulate Shiny Chariot and there was still lacking an important element. She even felt it herself as she was watching Red Team performance. And that had to do with the fact she had no one to complete with.
It's not a matter of them not doing it, it's a matter of not doing it enough. Also, she needs to be the butt of the joke sometime.