Inazuma's capable of suppressing her own natural verbal tick, though? I get the sense she'd end it with -nanodesou.
Also, I think the joke with Ikazuchi is that she's putting in both a stereotypical ninja old-fashioned particle (degozaru) and a more modern nonsensical verbal tic one (nin-nin) on top of that.
Erm... I don't really talk like that.Hand-me-downsINAZUMA KAI-2IKAZUCHI KAI-2F-Forsooth, I be Inazuma Kai-2!That's cramming too much characterisation in.Verily, Ikazuchi Kai-2 Maru is here! Nin-nin!