Without getting too deep into her background, Keiko is a shapeshifting Hydra from another world. Well, she only shapeshifts to and from her Hydra/normal forms, but she is capable of taking other appearances as well.

She speaks in a deadpan tone, so to compensate she is physically expressive. She also comes off as a tad eccentric at times. She has an odd fondness to the mundane and takes up such jobs as an apraisist or substitute teacher or what not. She is also married to a 24 year old wolf guy. She loves him so.

She is very loyal and protective of her loved ones, and as she has other abiliies, will not hesitate to use them to aid her friends if they so asked.

As an aside, she mostly eats only meat. Her digestive system cannot digest properly most anything else. She also cannot cook.