Spark is Cake's older adoptive brother. He's a pure pitbull who's heart is full of love and care for those around him. He specifically cares for Cake, just like a father would to his son. Spark does what's best for those around him, regardless of what pain he himself has to go through - he's also really resilient when it comes to physical pain. He's extremely protective of Cake, and will go to great lengths to eliminate the immediate threat.

Head-canon voice: Jonah Scott