Mutants and Masterminds Villain: Dr. Tako
There are many octopus themed villains out there. But so far as I know, none of them have *all* the powers of the octopus...except Dr. Tako.
Takamori Toshiko was born and raised in Tokyo, Japan. She studied very hard, and became one of the world's foremost marine biologists, specializing in cephalopods.
Unfortunately, when an alien vessel crash landed in the Pacific Ocean off of the coast of Japan, the damaged star drive bathed local cephalopods with strange radiation. All unknowing, when Dr. Takamori went to capture a large octopus to investigate recent strange behavior, she was bitten by the creature. Irradiated poison flooded through her veins, changing her....and she became...Dr. Tako. The alien mindset of the cephalopod and the trauma of the change caused her behavior to become erratic, and when she made it back to land, she decided to use her new found abilities to gain riches and fame, and perhaps get some revenge on the male dominated society that had treated her as second class citizen for so long.
Dr. Tako is PL8, and a decent master mind villain for lower PL teams. In addition to you wide suite of cephalopod powers allowing near perfect stealth, mimicry, and infiltration, as well as a credible threat is combat, she is highly intelligent, trained in many sciences and technology as well as medicine and psychiatry. A true polymath.