I mean not EXPLICIT romance. Small really light romance would be okay as long as it does not go into any... of well you know. Besides I think Zero would hate the idea of having a more human body. Though I think his MegaMan Zero body (his body from the MegaMan Zero series) would be okay.
His MegaMan Zero body.

In this body he is still the same height, just lighter more durable (more streamlined body.) Also since because of his body in MegaMan Zero being a copy he does not possess the sheer power (and the ability to grow stronger through the virus.)