Li'l Nyandam (コニャンダム ko nyandamu Kid Nyandam) is a boss enemy found in Saint Red Fox, the final stage of Dead End Night. When defeated, he may join the player as a cat unit - Li'l Nyandam, with a 3% chance.
The classic Awakened Bahamut + Cat Cannon interrupt can do a good chunk of it's health. Be sure that there is no strong supported by Li'l Nyandam's side, or else Bahamut may have no effect. With proper stalling and enough time, you can defeat this meddlesome child via rinse and repeating. However, it may be hard to find an opening in both the levels he appears in to do this.