DL Anniversary Birthday Cake is an enemy that only appears on celebration events when BC reaches a certain download amount milestone, starting from 20 Million Downloads Special Gift!. It's appearance gets changed after every 10 million download events.
An enemy with lackluster stats, it serves no threat and can be easily defeated.
Don't let its intimidating looks fool you; it's easy to defeat.
It does have a Metal trait to it, however, so Cow Cat or a critter will help on speeding the stage up.
Due to having lackluster stats, using Cow Cat will defeat it quickly and efficiently.