Nep-Enut

Nep-Enuts, also known as Nep-enuts, Super Big Nep-Enut, Super Big Nep-enuts, Giant Nep-Enuts, or blue Gargantua Blarggs, are Blargg enemies that debuted in Super Mario World 2: Yoshi's Island. They are blue counterparts to Gargantua Blarggs that reside in water instead of lava. The name "Nep-Enut" is an anagram of "", the Roman god of the sea.

Super Mario World 2: Yoshi's Island / Yoshi's Island: Super Mario Advance 3
First appearing in Super Mario World 2: Yoshi's Island and appearing again in Yoshi's Island: Super Mario Advance 3, Nep-Enuts remain submerged until Yoshi approaches it. It then rises, blocking Yoshi's path. Yoshi must throw a egg for it to submerge in the water (and only its eyebrows remain visible). If Yoshi jumps over it, it chases.

A particular Nep-Enut in the level What's Gusty Taste Like? lives in a secret underground area, and is located entirely underneath terrain and Semisolid Platforms, making it untouchable when it is not in its risen form. The Player's Guide specifies this one as a Submarine Nep-Enut, though the actual behavior between the two is the same.

Yoshi's Island DS
Nep-Enuts return in Yoshi's Island DS, retaining their behavior in its predecessor. They appear only in one level: Up the Creek. A new variant is also introduced: Egg-enuts, which dangles a fake egg and begins to flail if a Yoshi gets too close.

Yoshi's New Island
Nep-Enuts return in Yoshi's New Island, where three appear in Rise of the Nasty Nep-Enuts, two in the first area and the third in the last area. They chase after Yoshi. They take three eggs to cause them to temporarily retract into the water, rather than one.

Yoshi's Woolly World / Poochy & Yoshi's Woolly World
In Yoshi's Woolly World and Poochy & Yoshi's Woolly World, Nep-Enuts appear only in the course, Frozen Solid and Chilled. By tossing three yarn balls into them, Yoshi is able to stun the Nep-Enuts for a few moments. They spit out Shy Guys at Yoshi. Nep-Enuts can be instantly frozen with an ice watermelon. They can be climbed on during their frozen state, but release themselves from the ice after a short while. However, Nep-Enuts can be defeated permanently if Yoshi pounds them while they are frozen by the effects of an ice watermelon.

Yoshi's Crafted World
In Yoshi's Crafted World, Nep-Enuts appear only in the level Pirate Pier. They are made of bubbled slime and have the same behavior as usual. If hit with an egg, they will briefly retreat spinning below the water.

Mario Kart series
In Mario Kart 8 Deluxe and Mario Kart Tour, a mountain-sized Nep-Enut appears in the background of the Yoshi's Island course.

Unused appearances
At least one Nep-Enut was originally going to appear in Paper Mario, but was removed from the game.

Super Mario World 2: Yoshi's Island

 * Shogakukan guide: 池に住む怪物. タマゴを当てて水の中に追い返そう. (A monster living in a pond. Hit it with an egg to drive it back into the water.)
 * Player's Guide
 * Nep-Enut: Rearing up from the inky depths, this bottom-feeder turns pale as a ghost if you bop him with an egg.
 * Submarine Nep-Enut: Too much time reading underground comics has made this beast a regular pussy-cat. Just hit him with one egg.

Yoshi's Island: Super Mario Advance 3

 * Shogakukan guide: 水の中に住む怪物. タマゴを当てて、水の中に追い返そう. (A monster that lives in the water. Hit it with an egg and drive it back into the water.)

Yoshi's New Island

 * Shogakukan guide: 水辺に潜み、ヨッシーが近づくと水辺から浮上してきて襲ってくる. 倒せないが、タマゴを3回当てるとひるませることができる. そのすきに逃げよう. (It lurks near the water, and when Yoshi approaches it, it comes up from the water and attacks. You cannot defeat it, but if you hit it with an egg three times, it will go down. Run away while you have the chance.)