Dexter

First appearance: The Mysterious Five Project

Latest appearance: The Mysterious Seven Project

Dexter is the main protagonist of the 90's cartoon, Dexter's Laboratory. On the outside, he seems to be just another nerdy boy. But in reality, he is a villainous young scientist who has his own lab, where he conducts several experiments using chemicals, machines, and many other scientific objects.

When Dexter was born, he was brought home by his parents. He soon met his older sister Dee Dee, who noticed his bellybutton and asked, "Oooooh! What does THIS button do?!", seemingly for the first time, thus pressing her finger into it and making Dexter cry. As Dexter grew, he tried building things, but Dee Dee continuously harassed him, trying to play with him and breaking his creations. When Dexter was finally fed up with his sister's reckless behavior, he got into a fit and accidentally uncovered an empty room. Then, he realized he could build a private lab there and avoid Dee Dee. Unfortunately for him, she soon discovered his lab and destroyed it. Ever since then, Dee Dee has been continuously bothering her brother in his lab, pressing every button she asks about.

Dexter is a rather arrogant young man who is basically one of the smartest children at his school, only being rivalled by his archnemesis Mandark. He seems to have an interest in girls (except Dee Dee, who he believes has "cooties" hiding in her room), and apparently hates brussel sprouts and other vegetables. Despite his seemingly selfish nature, Dexter appears to have a heart for his family and will do whatever he can to help them and protect them from danger.

Moveset
Dexter's moveset in the Mysterious X Project series mainly consists of machines he brought with him from his lab to the battlefield. In The Mysterious Seven Project, he can additionally transform into Dexstar.

As Dexter

 * Standard Special: Blaster - Dexter pulls out a laser pistol and shoots it. The laser moves straight forward into players.
 * Side Special: Get Them, Dog! - Dexter summons his dog and sends him at the opponent specified.
 * Up Special: Dodge, Ball! - Dexter shoots a dodgeball into the air, and it bounces around the area's walls until it falls out of the battlefield or hits at least ten walls.
 * Down Specials
 * M5P Only: Metallic Slam! - Dexter uses robotic fists to create a small shockwave.
 * M7P Only: Dexstar! - Dexter transforms into his superhero alter-ego.
 * Super Move: Robo Dexo 2000! - Dexter unleashes a giant robot that shoots out missiles and giant orbs of energy.

As Dexstar (M7P Only)
Dexstar is Dexter's transformation in The Mysterious Seven Project, using several superpowers borrowed from other heroes from his dimension in battle.
 * Standard Special: Loud and Clear! - Dexstar uses White Tiger's roar, stunning opponents.
 * Side Special: Quick as Lighting! - Dexstar uses Valhallen's boost, dashing into the direction specified.
 * Up Special: G is for Grow! - He uses Capital G's size-changing ability, growing up to three times larger.
 * Down Special: Back to Normal! - Transforms back into Dexter.
 * Super Move: Can You Feel the Heat?! - Dexstar uses Major Glory's heat vision, shooting lasers everywhere and eventually releasing a large laser beam.