I found something that is pretty cool, New Avengers 18 has something like a full list of depowered mutants, though many like Polaris, Magneto, Xavier, Unus, Xorn, and even Stacy X, have gotten their powers back, in some cases, without an explanation. And I don't know if Blob and Callisto got their powers back. Callisto may have been simply fighting well as a human last year vs Sabretooth, and Blob may still be taking the mutant hormone drug.
Most are very minor characters. The biggest ones are
Aero, a Guthrie like Cannonball and Husk and Icarus
Angel Dust, iirc, the super strong woman of the Deadpool film was her
Christoph Nord-Maverick
Artie
Freakshow
Harpoon, a marauder
King Bedlam, brother of Jesse
Kiwi Black, half brother of Nightcrawler like Abyss, son of Azazel
Jared and Adrian Corbo, Alpha flight members, probably the sons of Unus the Untouchable and brothers of Unuscione
Scanner, an Acolyte
Shola Inkose
Slipstream, brother of lifeguard
Wicked