Didn’t know if this would be considered a game or not so I put it here.
Basically take one non-gundam franchise, and cross it with Gundam, it can be any Gundam Universe you want or it can be all new mechs and such to fit that franchise.
You can post more than one cross OFC.
Mine would be Mass Effect, with a Unique Gundam universe with mechs that suit the various charictars.
Biotics would be allong the lines of Newtypes, the Geth would have massive mechs that they can controll that’d be huge Geths, Shepard’s MS would be customizable with what parts and such you want (like his Armor), Garrus would have a Sniper mech for sure, there’d still be one foot combat, the reapers would have some Reaper-fied mobile suits from the various alien cultures, sleak feminie designs for the Asari, more millitaristic for the Turians, and insanely huge Krogan MAs. Also there’d be MS sized versions of the foot weapons so yes Giant MS sized Widow sniper rifles. (And unlike Most gundam series few particle weapons.