This is Geo, the crab of the hour. He was unwillingly propelled into this universe and crash landed on aquarius. This Crash landing annihilated his right eye and hand. Thanks to his new friend Ace's large popularity, he got the parts replaced with the pirate decor option.
You may be wondering if the hat on Geo has any signifigance other than looking really cool. The Hat is actually named Hatthew and comes from a rare family of 'cursed caps,' which are beings enchanted by an unkown source. These beings are transformed into various hats and gain sentience and cool ghost powers. The patch was a result of a hard fought victory against Ace's greatest rival.
"Now who's this Ace guy?" I hear you asking yourself. Well Ace Jelly is the best chef on this side of the universe. Ace is most known for his hit success of Microwave Poffins (a tasty pastry filled with jelly and an ice cream like substance) that are ready in just 3 microwave minutes. But he's also great in the art of combat, using his jellyfish tentacles to shock, sting or poison his foes.
Nobody really knows why or how slip came to be, but Hatthew claims to have heard him move into the salon he lived in. Rumor tells that Slip is a direct disendant of the omnipotent devil known only as "Paco."