Pink Wither

The Friendly Wither was a recurring April Fools' mob present in both Java Edition 2.0 and Bedrock Edition and 15w14a. There of a version of this mob in the Feed the Beast Mod called the Pinkanator that looks just like it that is inspired by this mob.

Behaviour
In 2.0 it could be summoned by placing a potted rose atop pink wool. The newly spawned mob has one head.

The pink wither would follow players holding sugar, and feeding it said sugar would cause it to grow more heads, up to a maximum of three.

It would apply an effect similar to bone meal upon surrounding blocks, whose range would be increased by its head count. It would also heal surrounding mobs.

Unlike the regular Wither, it is not classified as an undead mob and classified as a hostile mob

In 15w14a, it replaces the wither, firing skulls with a bone meal effect.

Drops
Pink Wool, Flower Pot, Poppy, Nether Star

ID
ID was FriendlyWither in 2.0, not sure about 15w14a.