[quote=@Espada Emi]My idea is for sort of a mostly cephalopod themed superheroine in terms of powers (super strong and flexible tentacles and body, limited shapeshifting/camouflage, able to swim at high speeds through water jet propulsion, limited regeneration, can shoot high pressure ink or water from hands or mouth etc) but taking some cues from Aquaman or Namor as well.

In terms of secret identity stuff I was thinking of tying her to the Filipino diaspora somehow since 1920's California is kind of a big time for that and something I can speak to a little culturally, but not sure could just go with the underwater civilization angle.
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Is 'Can mimic the abilities/biology of sea life and communicate with/command them' too broad? Would I be better choosing specific traits like my previous 'mostly cephalopod-like traits?'
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1. If you're still considering a Filipino heritage for your character who might want to check out this [url=https://en.wikipedia.org/wiki/List_of_Philippine_mythological_creatures#Creatures_of_the_water]Wiki page[/url] that lists a few water-related creatures of Filipino myth if you're not already familiar.

2. If you didn't want the cephalopod route, here's a [url=https://powerlisting.fandom.com/wiki/Fish_Physiology]page[/url] you might want to check for power ideas.