Luca first appeared when Don Lino and the puffer fish Mr.Sykes were having a talk inside the sharks' Headquarters. Lino told Sykes to work for his sons afterwards. Sykes said it's possible with Frankie, but Lenny, he's not so sure. Speechless, Lino sighed,Luca. and asked Luca to play the tape.
He frequently annoys Lino; yet, he's still loyal to him. Luca is stupid at times, asking Oscar to nod his head over the phone, mistaking Lino to work at the pizza shop and pouring coffee underwater. Luca plays the piano and his favorite song is "Baby Got Back" by Sir Mix-A-Lot.
Luca is a blue-green 8-legged octopus with a big head.