Captain Falcon is a bounty hunter
G&W has many games that involve him doing many different things
ROB is a robot
Villager collects stuff.
Wii Fit Trainer does Yoga
Pac man eats spheres. I mean you can give him arms and legs but no other note worthy attributes. It's difficult to make something like that exciting. The difference between Pacman and these characters is that the other characters have gimmicks, or something noteworthy. Even if they aren't exactly fighters, they have a gimmick. Captain Falcon is racer, but he is a bounty hunter. G&W is just a game, but he has a bunch of games involving him doing many things, ROB just spins tops, but he's a robot, Villager collects stuff, but he has a lot of stuff, Wii Fit Trainer is a yoga instructor, but she is athletic. I honestly can't think of everything for pacman except for eating spheres since he has no impact on the modern gaming world.
Pacman was in Street Fighter X Tekken, but you didn't play AS Pacman, you played with him in some wooden robot suit thing with no attacks relating to what he is or does, a total cop-out. I don't want to see that again.