Been said by a couple others, but it's probably pretty meaningless to scale them, since they're all supposed to be close in power. That aside, I'm gonna try anyway, and insert a little personal bias and a fun theory along the way.
Everything here in spoilers is about the powerscaling question, and reviewing each character I'm considering, which are mostly the guardians+ a few others.
Por ahora, 0 es mi nivel no clasificado, para aquellos que no quiero considerar por el bien de la discusión.
0. Potencial Pyeka, Reina, Maestra de Magia. Reina Sirena
1. Regina (Seguramente en su estadio local. Posiblemente en cualquier lugar)
2. Naya
3. Yakuu
4. Pyeka, otra vez
5. Probablemente Maryen/Kendra.
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I completely agree with your analysis, I've done Yakku's route to see "his strength" for my story but there's nothing xd, he only kills the little disobedient ones, nothing to highlight. Regina is really op from that point of view.