Tomomo has trouble meeting people and, as a result, created the Poppos and Kai to make herself look better. She later confesses to cheating in the final battle against her.
Tomomo purposely had Poppo steal items from the main cast in order to lead them to her.
As the result of having intentionally overpowered stats, there was originally an option to disallow Tomomo from multiplayer lobbies. In Version 1.7.7, this was replaced with the Softened passive for Tomomo, which only applies in multiplayer.
Tomomo's design had changed prior to release.  Her original design can still be seen on Super All-Out Mode.
Tomomo has been lonely. Option to allow Tomomo has been removed from multiplayer lobbies.
Instead, Tomomo has applied the following effect to herself during multiplayer games: "Softened: Tomomo is playing with friends and has lowered her attributes." Lowers her HP from 6 to 4 and Evasion from 1 to 0.