This oddly animated muffin unfortunately has no meaning or use in the game other than to boost User Rank. The best it can do is offer some support in early Empire of Cats stages like Korea or Japan, as it will falter and die at any real threat, like Master A. Unfortunately, no amount of boost will save it from this fate either, as they have too low base stats. Adding to that, Nebaaru-kun's recharge rate is too low, and even with combos like Biohazard & Bony Bone supporting it, Nebaaru-kun still is not reliable due to proc chance and has too short range to be used safely.
On the plus side, this thing has a 30% chance to Slow Floating Enemies for three seconds, which may be useful, as you can use her like a suicidal debuffer, unless you have a rapid supply of meatshields to protect him, like Tank Cat or the CrazedCats. Even then, the duo will be useless without protection, and even then, if you want a Floating debuffer, it's just a better idea to invest in Sanzo Cat, who has useful Talents and is able to Survive a lethal strike.