Dark Laser was originally just a toy, the leader of a series of toys modeled after the Empire from Star Wars, with Dark Laser himself being a parody of Darth Vader. When Timmy's magic copy machine brought Dark Laser to life, he quickly set off to cause destruction in Dimmsdale. After being defeated by Timmy, Dark Laser swore revenge, and has resided in space actively trying to trick Timmy Turner and lure the boy to him so that he can destroy him. It is not clear if Dark Laser is an alien, a toy, or a robot, though he considers his attacks on Earth as an "invasion".
Dark Laser wears a black space suit and helmet, and speaks in a deep voice, reminiscent of the real Darth Vader. It is unknown if he is a human, toy, or even an alien, although the latter seems most likely as he has an army of space robots at his command, and wants to dominate Earth once Timmy Turner is out of the way. Dark Laser also has a variety of buttons on his suit which can transform him into different objects, such as a life raft, hinting that he may also be a giant living toy. Timmy and Tootie use the threat of pressing these buttons on Dark Laser's suit against him.
He is extremely evil, although like most other villains, his own incompetence is usually his worst enemy moreso than Timmy. He also tends to do a weird laugh where he will mumble something quickly in between his laughter. Dark Laser showed a small shred of kindness toward Timmy by lending his spaceship to him to help find his family during "Wishology", although he was back to his old evil ways by the end of the special.
He has attempted to go through with a number of evil plans, as in his first appearance he made the Death Ball, parody of the Death Star. In "Escape from Unwish Island", he helped Imaginary Gary to defeat Timmy. He also pretended to have his own university in "The End of the Universe-ity" to recruit Timmy over to the dark side. Dark Laser also has a toy dog called Flipsie, which was also made by Timmy in the magic copier, and then Dark Laser stole him as his companion and fellow toy pet. Dark Laser was also recruited in Timmy's army to battle the Darkness, specifically to find a powerful wand on the Blue Moon of Vegan 6. He was also briefly incinerated in Dread N' Breakfast, but brought back to life by Wanda because Timmy didn't actually want to kill him.
In order to lure Dark Laser to Earth to use his spaceship, Timmy Turner created a TooYube parody of Dark Laser. The video featured Dark Laser sticking his butt out and making fart noises. The video reached over a million views in a matter of seconds. Dark Laser quickly came to Earth to destroy Timmy, but was convinced into helping him get to the Blue Moon of Vegan.