Remoraid is a light blue, fishlike Pokémon with saucer-like eyes, and a mouth with four pointed teeth. There are two dark stripes on its back that resembles the barrel of a revolver. It has a single pelvic fin positioned like a revolver's trigger, two small pectoral fins, and a dorsal fin near its mouth resembling a gun's front sight. In addition, it has two caudal fins, the bottom of which resembling the butt of a gun and the top resembling the hammer. All of its fins except for the dorsal fin are white.
Remoraid is well known for its ability to shoot jets of water with incredible accuracy and distance, often to shoot down prey, such as Burmy, out of the air. The water attack can reach its prey from about 300 feet away, even when the prey is moving or flying. Because of this, Remoraid is referred to as the "sniper of the seas." It tends to travel by attaching to Mantine's fins or in large groups of its own kind. It does this by using its dorsal fin, which acts like a suction pad. When attached to a Mantine, it feeds on whatever the Mantine leaves behind, but will fight alongside it as well. A school of Remoraid is often seen working together and traveling with a Mantyke, helping it achieve its evolution into Mantine. Remoraid is a sea-dwelling Pokémon, travelling downstream from rivers especially when evolution draws near.
The Gunfish enemy that appears underwater in Stage 6 of Pulseman bears a resemblance to Remoraid, as they are both combinations of fish and revolver pistols. This may be on purpose due to the fact that both Pulseman and Pokémon are created by Game Freak, and Ken Sugimori designed the characters for both games.
Remoraid's talent for shooting attacks is similar to an archerfish's. Considering its relationship with Mantyke and Mantine, it also appears to be based on a remora. Its shooting abilities, general shape, and appearance make it similar to firearms, more specifically, revolvers.
Remoraid may be a combination of remora and raid (rapid attack).
Teppouo may be a combination of 鉄砲 teppō (gun) and 魚 uo (fish), which combine to form 鉄砲魚 teppō-uo (archerfish).