The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
A. the character is a homebrew character and B. the character was not touched on already in comics, in TV/movies, OR video games.
Those are the only real criterion met with the selection of database characters here: I mean, even anime characters--so far outside of the mainstream--get selected here.
You mean, Green Guardsman doesn't belong?
Tom Turbine doesn't belong?
Black Siren doesn't belong?
The Streak doesn't belong?
Ray Thompson doesn't belong?
Do Apache Chief or some of the other Superfriends not belong, because I don't think "all" of them were in a comic book(some were solely the possession of Hanna-Barbara and not DC)?
SO, AS YOU CAN SEE, COMICS IS ONLY ONE OF THE ROADS TO SELECTION, BUT IT'S NOT THE ONLY WAY TO SELECTION.