As for nicknames... If he can sometimes be Autobot Kamen complete with cape, opera mask, and giant dart/javelin roses, then he can certainly be Pinkie sometimes too.

Narf! C'mon Brain, everyone loikes a party. You can even wear one o' these pointy little 'ats!

--
"Okay, I got your henshin pen from Lu- er - from the top-secret Moon Cave, so here it is!" Usagi chirped. "Just hold it up and say the first thing that comes to mind!"
"This feels really stupid," Ranma deadpanned.
The pen shot a few raspberry colored sparks and made a rude noise. - R1/2&SM: No Henshin (unwritten)