Mostly using the stuff pointed out about Omni-Man's speed at the start as support and
taking the general idea from this comment. This is aimed at characters whose flight gives them a huge mobility boost
and all the intended heavy-hitters who've kept up with them. This would affect all viltrumites, as well as characters up there like Immortal, War Woman, Martian Man, Allen and Battle Beast and Hail Mary. Going with this option would lead to:
- Downgrading various characters: Starting with Atom Eve. Removing her scaling to Conquest, she's
reacted and
blocked attacks from Killcannon, which are calculated to be
Supersonic+, making Cecil's statement that
she can fly to Mach 3 consistent. Low tier characters like
Rex Splode and
Shapesmith would scale to this, as well as the Maulers and Season 3 Oliver, and it would also serve as the lower-end speed for characters like Immortal, War Woman, Martian Man and...all those above them.
- For the Guardians I could see a clear cut "Supersonic+ holding back, to Massively Hypersonic+" and for viltrumites who scale to Nolan "Supersonic+ holding back, to Massively Hypersonic+, up to Massively FTL+". I'm making that distinction for the MFTL+ rating as, again, I'd rather people show feats on par with viltrumites' interstellar travel rather than the entire verse mooching off them, most Immortal has is his brief encounter with Allen in space, who's massively holding back.
All of this however hits a road block with Mark, as with him it's not as simple as switching values around. To begin with, he isn't supposed to be
faster than Immortal til Season 2 (this whole bit has to do with flight speed), but he's been rated as Relativistic since day one while Immortal's flight speed has been chalked up to the Mach 3 statement for a while (which as seen with Omni-Man, flying and combat speeds are instrinsically related and it makes no sense to treat Immortal like this weird outlier with combat speed magnitudes above his flight), not to mention the notable antifeat right at the start of Season 3 where
he strains himself to pull a sub-relativistic feat, but even if we were to remove his initial scaling, he doesn't really have a good replacement, as the
other two (P.S
Mark scaling to the first feat is apparently bunk) he has are faster than Immortal's own peak speed feat.
- Best I can think of for S1 Mark is "Supersonic+ holding back, up to Relativistic". That's of course if we keep hanging onto it and not dismiss it now as an outlier due to current showings. Hail Mary is also downgraded further to Supersonic+ as that's the speed everyone in that fight is meant to be at
As said above I'm more than open to suggestions for these, as for example I'm not sure where Powerplex would end with this lol, neither Red Rush tho I assume upscaling Immortal or feats of his are calculated and yield higher than him, at least in his case his speed is explicitely stationary.