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.
- Lain has omniscience, it's not possible to tell her a story about something she doesn't know because there's no such thing which she doesn't know
- She is omnipresent in every dimension, The Wired, The Physical World, and on a plane beyond that
- Lain is at least that much higher- or beyond- dimensional that physical reality is seen only like a hologram to her, where she can create any number of avatars of herself
- Can easily destroy any barriers between dimensions and merge them into 1 reality
- She can rewrite the past, reset the story, warp reality, erase and rewrite everyone's memories
- Lain has cosmic awareness of everything
- She certainly cannot be beaten with ordinary methods since her true self exists outside of physical world.
- Even very strong hax like e.g.causality manip and time / reality / story reset does not affect Lain either
- She also beat some other guy who was already a (self-declared) omnipotent + omnipresent God, and she warped him out of the story with reality manip
To summarize all of this with one simple term:
Lain Iwakura is an omnipotent God. Not any God, but the "one & only true" God. At many times in the story it was also revealed that she always existed, and (final episode, when her friend Arisu had grown older) will exist for eternity.
For all of the aforementioned reasons:
Lain stomps.
Oh yes, until I've assemled all the important screenshots from the Anime myself (which WILL prove everything I posted above), feel free to research Lain in other fandom wikis, both of which scale her to 1-A / High 1-A, too:
Profile #1
Profile #2
So yeah, Lain is definitely Outer.