Cobalt Gemstone

Cobalt is a member of the Gemstone Guppies. He has a great sense of humor. He has bratty qualities such as whining when things don't go his way. A recurring joke that he's involved in is that he tries to get the attention of females, whether they're his classmates or side characters, and to no avail. His alternate name is Jake. He is often mistaken for being related to Sapphire because they have similar colored hair, but this is not at all the case.