So, being a Touhou fan and a hardcore Gundam fan, I've always expected this. Anyways, here are my hybrid-thingies:
-Reimu Hakurei x Unicorn Gundam Perfectibility (Red Psycoframe)
-Marisa Kirisame x Gundam Double X (with G-Falcon unit as a hoverboard)
-Sakuya Izayoi x Beginning 30 Gundam
-Cirno x Hi-Nu Gundam
Hong Meiling x God Gundam
Honestly, that's all for now. New ideas will always be appreciated!