Perhaps Ai-Kun changed to mini Vajra too before turning into sting ray... but this is just a theory though...
Btw...
I didn't know where to post this question, so here it goes...
What happened to Nene Rora? Haven't seen her since Episode 14 of Macross Frontier.
(And no, the dead S.M.S. lady from episode 20 wasn't Nene...)