Purple Magicy is a side character in Dream Land Defenders (my passion project), being the result of a failed experiment Henry did while studying Purple Magic. (He technically isn't made out of Purple Magic, but the name just stuck after Henry called them that)

Originally they knew nothing and could barely speak, but learned surprisingly quickly. After not too long they started being Henry's lab assistant.

As for gameplay purpose, the current idea is that they sell you potions which enhance your stats and stuff, but I haven't entirely thought it through yet.