I have to confess, I am a sucker for "basic" suits due to being drawn into Rider via Den-O. You want a nice simple undersuit and then the 'kibble' can be interesting as long as you do 'form spam'. THEN, you go wild for "Super" and "Final" forms.

If My-Th is going to be a mouse, then the secondary rider better be a cat and the third is a dog.

COMPLETE THE MEME TOEI!

PS: If this meme happens, then I'll guess final forms now:

mouse = Golden Fleece
cat = Sphinx
dog = Cerberus