These are the best selling franchises that has 0 representation in smash ultimate (numbers by wikipedia so it isn’t 100% accurate), i will not take into account sport (includes racing) games or anything based on license things (Example: Lego or Star Wars)
1) Call of Duty (2003, 400 million)
2) Grand Theft Auto (1997, 345 million)
3) The Sims (2000, 200 million)
4) Tomb Raider (1996, 82 million)
5) Halo (2001, 81 million)
6) Worms (1995, 75 million)
7) Borderlands (2009, 70 million)
8 Red Dead (2004, 60 million)
9) Battlefield (2002, 57 million)
10) Civilization (1991, 57 million)
11) Mortal Kombat (1992, 54 million)
12) God of War (2005, 51 million)
13) Crash Bandicoot (1996, 50 million)
14) Far Cry (2004, 50 million)
15) Diablo (1997, 50 million)
note that in these top 15 there is Resident Evil, Assasins Creed and Elder Scrolls that only have spirits or dlc mii costumes.