First appeared in Just Imagine: Green Lantern #1 in 2002 and was created by Stan Lee and Dave Gibbons. Leonard “Len” Lewis was a professor who became the Green Lantern after being empowered by Yggdrasil.
Sorting fictional characters by their first names, not including actors or anything. Since somebody has decided to exactly copy this story just know that this is the original, and some people need to get some creativity