Felix (Lilo & Stitch)

Experiment 010, later known as Felix, as well as Oscar, is one of Dr. Jumba Jookiba's many genetic evil experiments. He is a cousin of Stitch and recurring character in the franchise. Felix first appeared in the Lilo and Stitch TV series. His one true place is doing janitor work and cleaning things and recycling. He is voiced by Tress MacNeille.

Personality
Felix was originally obsessed with cleanliness to the point that he considered even people germs that must be sterilized at all costs. After Felix was reprogrammed, he became obsessed with dirt.

Lilo & Stitch: The Series
Because of 010's tendency to throw out anything even remotely unclean (including prized belongings) Gantu sent 010 to Hämsterviel, but Hämsterviel also found 010 annoying, and thus sent him back to Gantu, who abandoned 010.

Left with nothing else to do, 010 started cleaning up the island until he was discovered by Lilo and Stitch, who took him home and named him Felix.

At first, Felix's cleanliness proved useful, until he began destroying and throwing out Lilo, Stitch, Jumba and Pleakley's personal belongings.

Eventually, Felix decided to "sterilize" the four as well, and, locking them in the house with him, relentlessly pursued them until they were able to trap him.

Jumba then reprogrammed Felix to be less of a neat-freak, but rather than just like dirt, it caused Felix to begin making things incredibly dirty.

Thus, Lilo and Stitch sent Felix back to Gantu as a present, but due to his new programming, rather than help Gantu clean up his ship like the latter hoped, Felix made it even dirtier.

Felix reappeared in "Snafu," and was freed along with Gantu's other captive experiments by Lilo, Stitch, and several other experiments in a rescue mission.

Stitch!
Felix is a recurring character in the anime series. He is one of Stitch's closet friends and regained his cleaning habit but mellowed down compared to his original state. He frequently appears joining Stitch on his quest to become officially good and the most powerful being in the universe.

Disney Parks
In Tokyo Disneyland, Felix is a popular character being that his franchise is extremely popular in Japan. Other than Tokyo, Felix is not seen in any other of the Parks around the world.

Dreams Within
In Tokyo Disneyland, Felix joins other Disney characters as they celebrate the magic inside everyone's hearts.

Trivia

 * Felix appears, along with several other "Lilo & Stitch" characters, in a parody of the Disney Channel Original Movie High School Musical, which was broadcast as part of the High School Musical: Around the World one-year anniversary special.
 * Felix's pod color is green.