This is a type of collaborative storytelling frequently seen in the FandomAH section of the forum. The original concept took inspiration from the wiki pages from DC and Marvel wikia, describing a character's physical attributes before going into a biography for said character. Typically these sort of threads involve Marvel or DC comics, but there are some for other properties like Star Wars or Image Comics.

Build a Better DC Universe

Build a Better Marvel Universe

Build a Mirror DC Universe

Build a mirror Marvel Verse

Build a Mirror Marvel Universe

Let's create our own switched Marvel and DC universe

Build an alternate Marvel universe

Build a DC universe: Earth 10

Build a marvel universe: Earth-597

Build A DC Universe: The Wasteland

The Red Planet - Build A Marvel Universe

Look To The Stars: Lets Build an Alternate Marvel Universe

Build an Alternate DC Universe (earth 92)

Lets Build A DC Universe Volume ???-Earth 28

Lets Build A Marvel Universe Volume ???-Earth 3

DC Universe: Earth 30a

Build an alternate amalgam universe

Earth 30x

Marvel's Version of Red Son

Earth-6127: Age of Wonders

Earth 0963

Let's Make A Marvel Universe (version 5251)

A Tale Of Three Worlds (DC Comics Collab)

Lets make A Kaiserreich Super hero Universe

Earth-Zeta (DC/Marvel Merged Universe Collab)

Build a Star Wars Expanded Universe (Collaborative)

Earth-Epsilon: (A Public Domain Superhero Collab Universe/Earth-Zeta Spin off)

Earth-3839623: A DC-Marvel Universe (Superman/Batman/X-Men/Spider-man)

Welcome to the CartooniVerse: A Collaborative Cartoon World Thread

Let's Make A DC Universe

Let's Make A Marvel Universe (version 2005)

Lets Make A DC Universe (Earth-194)

Let's Make A DC/Marvel Crossover! (Earth 2198)

Let's Make a DC Universe. (Earth-Two.5)

Let's Make an Image Universe (Earth-ABC)

Let's Make A DC Universe (Earth-4P)

Let’s Make a Marvel/Dc Universe(Earth 932001)

Let's make a Marvel Universe. (Meta-Change Edition.)