I hope you're actually serious about that, because I've been thinking about the same thing except for multiple characters but never had the time.
Basically the reason why we have so many supersonic ratings is because of
this calc for Shoto's ice.
The issue with this is that the blinking speed being used is the one which yields the highest possible, high-end result (0.1 seconds). Both
the source cited about blinking speed and multiple other sites you encounter on google lists blinking speed as ranging from 0.1 seconds up to 0.4 seconds, or 0.25 seconds or 0.3 seconds in other sites.
Just using 0.11 seconds for blinking speed and it already gives you 350 m/s (Transonic).
In my most humble opinion, using 0.2 seconds as the mid end value is probably reasonable, which results to 192.5 m/s (Subsonic+). Hell, even using the low-end 0.4 seconds results to 96.25 m/s (Subsonic (Faster than the Eye)) which is consistent with its FTE statements, although this is probably too slow and we do know that students are superhumans does having way higher standards of FTE movement to their perspective.
And there you have it, subsonic+ Toga lol (her profile says she outpaced 5% Deku, but this was Deku after getting beat up by Muscular so not really sure if it counts tbh).
Not sure if people are ready for this conversation lol
Off-topic, does this forum website/format suck for mobile users or is it just me?