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Rai 0. Requiem for the Wreckers. Dinobots Salvation. This is a good question as one off issues are often of dubious quality but there are some good things out there.
Cause one shot is all he needs!! Nah, for real I don't know. I'd really need to think about it. Do you mean a completely self-contained story that has no ties to established characters, cause that's really hard to think of. For example, I love "Batman: The Killing Joke" and "Wolverine: The Jungle Adventure" but those are connected to long running characters.
I'd think those count. It's hard enough to market a one shot without it having some tie to larger continuity.
"Wolverine: The Jungle Adventure", one of the first Marvel one-shot comics I read growing up, and just a fun Logan adventure in the vein of an Edgar Rice Burroughs Pellucidar story. Mike Mignola's art works very well with that type of genre. Spoiler: Spoilers for the Book I probably wasn't the only one who thought at first that Daken was the son Logan sired in this book.
The Ninja Turtles where they meet that weird mutated genius girl,or the Ninja Turtles where they fight Loki in the museum of legendary characters. TMNT has a bunch of good one shots
A few for characters I read off the top of my head. Green Lantern - "Emerald Sands" (The Green Lantern #7), "Flight" (Green Lantern Secret Files #1) Wonder Woman - "Who Killed Myndi Mayer" (Wonder Woman Vol. 2 #20), The Hiketeia, Superman - "22 Adventures in a Single Bound" (Superman Adventures #41)