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.
How can he beat woman who beat literal universe creator Morgana and multiverse buster called Singularity ?
Same arm (Devil Bringer) which was cut off and healthy Dead Weight Man still defeated (like typical Gary Stue) Devil Sword Vergil.
As i said SDT Vergil looks terrifying in gameplay, but if we count only gameplay/game mechanics then Demon Slaves look more OP and destructive so as Sin Ritualised demons.
Technically Katana space warps can easily surpass Bayonetta's durability, but Arch Eve Origin still has access to purgatory. If Vergil can see her and know where she is it might be win for Vergil.
Cereza despite superiro feats she is still glass canon and can be easily suprise attacked. Not saying Cereza stomps but she has superior feats and defeated superior enemies like high tier faeries in general, Lukaon, Morgana, SIngularity lower vessels and superior vessel of Singularity.