A few straight forward feats which the values of are given to us directly!
1. Nebula's flight speed
Nebula is noted to be able to fly at over 800km/h, or 222.222222m/s.
2. Aqua's swimming speed
Betterman Aqua can swim at speeds of over 600 knots, or over 1000km/h. On average, 600 knots is 308.666667m/s, though this number is showm to fluctuate slightly above 600 knots (from 604 knots, with a highest seen speed of 606 knots, or 311.753333m/s.
3. Levi's length
Aqua's Psychovoice kills the monstrous super organism Levi, which is so huge it's fused with part of the sea floor. According to the official Betterman website, Levi was 2000m long (or 2km).
Final Results
Betterman Nebula's flight speed = >222.222m/s
Betterman Aqua's swimming speed (low end) = 308.667m/s
Betterman Aqua's swimming speed (high end) = 311.753m/s
Levi's length = 2km
1. Nebula's flight speed
2. Aqua's swimming speed
3. Levi's length
ベターマン
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Final Results
Betterman Nebula's flight speed = >222.222m/s
Betterman Aqua's swimming speed (low end) = 308.667m/s
Betterman Aqua's swimming speed (high end) = 311.753m/s
Levi's length = 2km