Couldn't you have answered your question in the same post you asked it?

Agito.

because I think having Agito's powers would be cool.

Kabuto.



Can literally go back in time.

Kuuga.

I want everyone to smile.

For me it would be Double.

Admitted, Wizard would be awesome. But I wouldn't mind OOO's or Kiva's power as well. Blade would be fine to, but... yeah, I hope I wouldn't have to take the same path as Kenzaki did. Poor boy.

All my favorite riders have some pretty normal basic rider powers....

I dunno I guess I would go with DiEnd because summoning any Rider would be pretty darn cool.

Kabuto because I gotta get back in timeeee.

Oh yeah. Considering I'm always late... Kabuto sure would help.

Probably decade or diend