@13-A-Lucky-Unlucky Yayyyyyy! Anyways, here’s my incorrectl theory :>
Candace (from Phineas and Ferb) is a siren. My proof in from the Aquabats episode “Lady Fingers” and the revolution came to me when I was drawing Quera (she's the siren with braces and who likes Ricky as well) and I was thinking of making a meme where it was like “fellas if your partner is a stereotypical teen girl with a weirdly long neck, that's not your girl thats a siren” when I realized that Candace fits that description. She is a stereotypical teen girl with a weirdly long neck (I am including Quera as a typical teen girl because she has braces and is pretty awkward, which I would assume as a trademark of a teen). I’m not sure if every siren has multiple heads like a hydra in the Aquabats universe, but I assume that the amount of heads can vary. Also more “proof” to this shaky theory, in the episode where Phineas and Ferb go to the museum and find a mummy, Candacae gets covered in gum and toilet paper, and resembles what the guardians of the sirens Vera, Hera, and Quera look like (the guardians of them being mummies). Another “point” to my theory is the episode where Jeramy and Candace get attached to the hip, which makes it so Candace has multiple heads, meaning that sirens could also get more peoples heads to add after they take their energy, so Vera Hera and Quera could have been triplets that turned into sirens, which also means that if they successfully took full control of Crash Ricky and Bones then they could also be attached, either to themselves or to Quera Vera and Hera. Is this an insane theory? Yes, but it’s just a theory, A FILM THEORY! Thanks for reading.