Illustration posted by Maruino of Princess Lightning and her human self, Ai. By the way, the human names of all of the girls from Class 2-F were revealed. Just a few of them we knew before, like Tetty's, Mepis, and Kumi Kumi's, but here's the rest of them.

Tetty Goodniigiru: Fujino Toyama
Miss Lille: Satoko Kanegafuchi
Wrappy Tip: Rumi Itadakita
Mepis Pheles: Fuko Sayama
Thunder General Adelheid: Adelheid Müller
Kumi Kumi: Kumiko Tateno
Classical Lillian: Miki Chikage
Princess Lightning: Ai Tanaka
Sally Raven: Risa Karasuno
Psyche Plains: China Mizuta
Narakunoindiko: Hitomi Goto
Ranyui: Saho Suzui
Calcolo: Calcolo Crunf