Koko

Koko is a rowdy small Sharkie with an attitude! His body is of clear glass containing sloshy liquid, which wiggles as he moves. 

He likes biting a lot of things, sharing a common hobby with Pako, but prefers to tease other Sharkies by giving them a big, slimy lick to the face.
_{This usually happens to Ollie}

It seems that Koko keeps Millie and Jonesy in high regards, however, and wouldn't want to make them cross!