Topper, A.K.A. Experiment 025, is an illegal genetic experiment created by Jumba Jookiba and a character in the Lilo & Stitch franchise. He is designed to give off a radiantly bright light with which to pose as an invasion-signaling beacon to the Galactic Armada. His one true place is as a Christmas star.
Befriended from another series
Note: this is only a parody and most likely will never happen in real series
Outside of Lilo and Stitch series, his current 'ohana and a new friends were Patrick Star and SpongeBob SquarePants (from Spongebob Squarepants). They first discovered Topper, when he fell from the bottom of the sea, or in this case, Bikini Bottom, just outside of Spongebob's frontyard. He thought at first that the starshaped being was his pal, Patrick, until Patrick arrived, and also seen him. Both Spongebob and Patrick thinks that he was one of Patrick's adoptive baby brother, however, when they both seen he was flashing, they've amazed at his of what they've thought it was "magic". They both spent time with him, playing all day, while Squidward disregards them as he was continuing painting with Zawp.
Later, Spongebob and Patrick was thinking of his possible name, as they both sees his potential. Patrick suggesting that his name was supposed to be "Spats", since his color is yellow, and Spongebob was a perfect description for it. However, Spongebob on the other hand, decided to named him "Pats", as he looks like a starfish, but he's flashing a blinding light, and also considering was Patrick was also a perfect name for it. However, their arguments started there, until they've both fought for it. They're both stop fighting when Jumba's voice was heard and he said that they're both are not need to fight about his name, as he revealed to both of them that his real name was "Topper", or Experiment 025. He also told both of them that his ability is using his flashing light to signalize the presence of Galactic Armada, but is also since it was a harmless being, he was also a perfect decoration for Christmas trees, which both Patrick and Spongebob was impressed on what Jumba's description to Topper told them. From there, they've finally agreed on Jumba's (well originally Lilo's) given name to it, and they'll both adopt him as their new freind, or 'ohana. Jumba, Spongebob, and Patrick build him a mini house under the billboard in front of Squidward's house to become their official neighbor too. As of now, Topper now lived under Bikini Bottom, was still staying with Spongebob and Patrick, as their playmate, and sometimes a caretaker to Gary the Snail. He also acted as asignalizer for both Spongebob and Patrick to whenever there is an unusual activity under Bikini Bottom, and they'll ready to jump in action.
Another thing is, Jumba also added a FLASHBOMB feature to Topper, so all of the 6 main characters disguised as a superhero from Spongebob Movie 2: Sponge Out of Water will transform and appeared.