A. Vivzie forgot they existed
B. There's only three of them versus IMP's four
C. Adorable isn't really what I went for in my own autistic headcanon for a proper antithesis team
The Cherub crew would also work better as side characters, their personalities are very bombastic so small dosages for the viewer would be best, so make their role that of support: Make them the entities providing the means to the anti-Demon team. Aerosolized holy water grenades, tomes of Biblical arcana for shutting down unholy magic, ways to sanctify weapons and ammunition, it is the
Cherubs that supply it as holy quartermasters to a group of humans who believe and or know Demons are killing humans and concluded that recreating DOOM is the best way to stop it.
The Cherubs are comedy relief to these Exorcists, as I will refer to them, who I would write as a killteam comprised of various satirized re-flavorings of Father Anderson from Hellsing. They are an actual threat and the best way for the main cast to survive them is to disengage and run. Assassin's don't stand and fight, they hit and fade, after all.
This would also address something subtly important: If it is so easy for Demons to get to Earth and act with impunity therein, why hasn't the Biblical Apocalypse already come and went by now? Murderous fanatics like the Exorcists serves as the answer. Going to Earth is a helluva risk for a helluva reward.
As a further aside about the heavenly side of things, I think angels, true full ranking angels above the menial workers like Cherub (even though Biblically speaking Cherubs are ridiculously powerful, just roll with it) shouldn't be depicted as characters. They should be forces of nature, living breathing delete buttons for all demon kind in their presence, an insurmountable final boss if you will. Our main characters are low to mid tier demons; Fighting an angel should be an unthinkable worst case scenario.