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.
FYI Suzaku is a nigh-omnipotent + omnipresent conceptual God who transcends all spaces, times and worlds, and he can warp reality, rewrite causality, make fictional characters real and real characters fictional etc
also, thanks to its nature is an isekai franchise, Fushigi Yuugi has pretty big cosmology, too - (parallel universes to where readers of a book can be warped, called "The Universe of the Four Gods")
Suzaku is very powerful, you simply underestimate him