Mother Brain

Mother Brain was a "Skylander" of the Earth Element. She belonged to Portal Master Porky and was direct rivals with Ridley since they argue over who's the better Metroid Skylander. Like Noctisark and Darkhowl, she wasn't actually a Skylander, and was more like a servant than a Skylander.

Biography
Mother Brain was searching for Ridley one day when she came across a portal, which happened to be the same one Ridley got to Skylands using. Upon stepping on it, she shrunk, but not as much as Ridley. She wandered around a dark forest for years, and soon started hibernating in a cave. One day, Porky Minch came into the forest and preformed tests on Mother Brain's brain when she was sleeping, and when she woke up, Porky's plan worked: she now bowed down to the pig king.

Later, when Porky and his other two Skylanders ran off with the Galactic Generator, Mother Brain battled the Mecha-Drago in the Drago Pit, and when she was defeated, she fell to the ground. The Mecha-Drago stepped on her neck, snapping it in half, killing her. She was buried by the Mecha-Drago and Fernstar.

Appearance
Mother Brain was a skeletal creature with an exposed brain. She only had one, white, round eye. There were numerous silver spikes all over the brain, and the reason she had these is unknown. Three large, long spikes extended from her back, and her limbs appeared to be made with Chozo technology. She standed twice as tall as Ridley.

Trivia

 * If you count Porky's "Skylanders" as Skylanders, Mother Brain is the largest Skylander, about the size of a small tree. If you ignore Porky's servants, this honor goes to Ridley, who is about twice as tall as Drago.
 * Mother Brain was actually much more intelligent than she looks, and she might've been smarter than her own Portal Master. This might've been because of her Chozo technology and her large brain.
 * She was in a small romantic relationship with the Commander before he died. This is ironic, because one story later, Mother Brain herself died.