Ex

Ex is the former Tetris King, and the keeper of dimensions.

Personality
Ex cares deeply for his allies, especially his daughter Ess. He's a very polite man who knows when he's in the wrong. He will often hold back his Tetris power when battling others to give them a chance.

However, when he became the keeper of dimensions, the loneliness he developed caused him to become depressed, and he had little motivation to do his work due to being unable to meet anyone or do anything else. When Satan and Ecolo helped create a portal for him to get away from his job for a little bit, it bettered this a lot, but he still has a bit of loneliness left over.

Emma
After Emma took a large fall that almost killed her, Ex found her and helped her heal from her injures, and the two quickly fell in love. They eventually married and had Ess together. However, eventually she left her parasol to Ess and disappeared, with nobody, not even Ex himself, knowing where she could've went.

Ess
Ex cares very deeply for his daughter. When he learned that he had to leave to become the Keeper of Dimensions, he created Zed to take his place as her father, just so someone could look after her while he's gone. As an unfortunate side effect, this means that Ess always assumed Zed was her only parent, as both he and Emma left before she could truly remember them.

Zed
Zed is Ex's creation to take care of Ess. He's very thankful for his work, but he is irritated that Ess sees him as her true father and not Ex.

Jennifer Skye and Iroha Nijiue
Ex is proud of Jennifer and Iroha for taking good care of his daughter after they started dating her, and he enjoys their company overall.