Fishstronaut is an anthropomorphic big fish and titular protagonist of the series of the same name. He wears a Bubblex suit that allows him to fly out of water. It also has numerous tools useful during missions. He is always watching his friends Marina and Zeek, and investigating the problems of the Smiling Trees Park in order to solve them. He lives at the bottom of Quiet Lake, though he spends more time out on the surface with his friends. He is also an aspiring inventor, creating machines generally useful to the park. He usually communicates through a video screen fitted into his suit.