This enemy is a force to be reckoned with: she has huge amounts of health, great DPS and only a few knockbacks. Thankfully she is considered a Black enemy, which means she can be affected by anti-Black cats.
Pizza Cat is a good idea to bring up against this unit, however don't try and use Bombercat to freeze her, as Bombercat is outranged. Several anti-BlackUbers also work well against her, as well as good generalist Ubers and Ururun Cat.
Dark Lazer references Darth Vader, a character from Star Wars. Since she is on the dark side of The Force, she has a red lightsaber.
The blue lightsaber from the cat unit shows that she is on the light side of The Force.
However, in the movies it was the other way around. Darth Vader started off as Anakin Skywalker and was a Jedi knight on the light side of the force but was turned to the Dark Side of the force as a Sith lord and became Darth Vader.