This is Legend, a 15-year-old inkling who lived in Inkopolis Square, until the tidal wave came and separated her and her wife. She is the main character of Chapter 2 and a side character of chapter 1. You first see her reaching her hand out to crying Orange, saying, "Are you okay?"
Part 2: Legend asks Orange if she is okay, then introduces herself. Orange then tells her what happened to Blue very briefly. Legend is very understanding and says, "I miss Vulpix. (her wife) She was the best thing that happened to me since Turf War. I'll do whatever it takes to find her." Orange then replies, "I'll be that determined to find Blue! I would do anything to bring him back!" Legend then says, "Rumor on the streets of Splatsville has it that if you travel through the abandoned passageways, you can get to where Inkopolis Plaza once stood. But it's really dangerous. Best just to exploit a loophole, like I always do." Orange then stands up and says, "I'm gonna bring Blue home."