Hey, does someone want to be Itsuki's tard wrangler?
While Momo is cool, I don't think it would be fun to always use her when Itsuki needs a tard wrangler, it would mingle their plotlines too much.
While someone Reiji could work, it would still, I dunno, make him dig too much into someone else's plotline and antics, rather than being an erradic third party on the field.

I kind of want a vibe like Jessie and James from Team Rocket? A villainous duo going around doing antics and falling into other people's plotlines momentarily.