I Raised Countless Superheroes [Western Crossover]

Klepparios, the Origin Wall that seals away the dark creator goddess Perpetua.

He possesses the dual divine powers of creation and sealing, and is also a collector, much like Brainiac, the AI from the planet Colu. The difference is that Brainiac likes Lego, while he prefers figurines.

Klepparios: "Earthling, I can grant you three wishes. Once they're fulfilled, you'll be stuck to my wall."

Little Cap: "I wish for world peace."

Little Bat: (Putting his little mental abacus to work) "..."

Little Iron Man: "Wow, have you really ever made something as ridiculous as world peace happen?"

Years later.

Red Hood: "If you could keep watching over me, I probably wouldn't die so young."

Doctor Doom: "Even divine power has its limits. How dare you leave my kingdom?"

Superman: "There has to be something that can stop this from happening."

Cyclops: "We don't want anyone to leave."

Thor: "My friend, we await your return."

Robin: "Listen, I don't care about some random alien hanging around on Earth, but you need permission from an Earthling before you can leave, too."

Nightwing: "Damian means that his wish is for you to stay."

Short version:

A genie who doesn't understand human hearts takes in a group of heroes with tragic lives, only to discover, rather inconveniently, that they all seem to have daddy issues.

Also serving as: the head of the Bat Family, the Justice League's shadow, Spider-Man's genie, Loki's true god, Iron Man's heart, Captain America's star-spangled banner, Superman's substitute, the Flash's resurrection artifact, and more.

Theme: The strongest buff lands in the hands of heroes with tragic backgrounds.