Dimentio

Dimentio is a recurring villain in the series.

(Not So) Elite Penguin Force
In (Not So) Elite Penguin Force, Dimentio is first fought in Chapter 17 after Mario transports the party to the future. However, Shy Guy stops them from destroying the ending and rewrites it.

Dimentio returns in Chapter 24, being fought alongside Wario. He is defeated again by Chill, Awesome and LMGT mostly.

Dimentio is fought for the final time in Chapter 29 by Mario, but the room explodes with them in it.

Puffle Launcher Lawn Chair
In Puffle (Launcher) Lawn Chair, Dimentio returns as part of the Villain Army in Chapter 2. He is defeated along with the rest of them.

Time Travelers
Dimentio returns in Time Travelers, where he crashes into The Library and demands the $100 that Future Shark owes him. When he refuses, he pulls Johnny into his swimming pool and becomes Super Dimentio. When it looks like the party is doomed, P.T. Piranha comes and saves them by using Majide Time.

The Mega Snowball Fight
Dimentio returns in The Mega Snowball Fight, along with Count Bleck, Mimi and O'Chunks. He manages to flee along with O'Chunks to avoid being tossed into a black hole by The Shadow Sirens.