Rather apologetic for a large machine. So, not an immediate threat, at least, particularly if he's focused on auto repair.

Akechi relaxes somewhat, resting a hand on his hip. "Well, I can't speak for the others here, but I have certainly faced more intimidating foes in the past."

Adam Kadmon towered over the Phantom Thieves, for starters. Not that Optimus is small by any stretch of the imagination, but the mundane setting does help.