Just when I thought I'd seen every wacky Transformers concept, the Japanese prove me wrong.
BEHOLD! TRANSFORMERS KISS PLAYERS!
(Yes, that site is in Japanese, here's a page with a flash demo of Optimus)
Back in the old days, we had Powermasters, where you had to link a smaller robot to the larger robot to make him transform. This is a similar concept in that Optimus can only transform when he receives a kiss from the anime girl he's supplied with. (I have no idea if there's some sort of mechanical functionality here, and I don't think I want to know).
Here Optimus snuggles up with his human friend Melissa. Optimus, you dawg.
Optimus also has a hot pink sword which transforms into a surfboard for Melissa to ride.
See also today's Shortpacked.
That's going to make one crazy tie-in cartoon.