Depends on the powers I guess. I have heroes with classic heroic names, ones with silly names and the ones named after songs. If I have to character in Kaiser's thread he would probably go with the name of : Animal King... Lord of the Beasts... Wildman or Nature Boy (after David Bowie song)
Tax Girl. I'd even have the catchphrase, "You gon' pay today!", before beating somebody's ass, LOL! If I'm being serious, I see nothing wrong with 'Kaiser'. Sure, it isn't the feminine version of that word, but it does sound better in my opinion.
If it is for a super speedster, then you can have black/yellow checkered suit and call yourself Taxi Girl... :lol:
Kaiser you is already an example of an everyday superhero. Your super powers is your words, your wisdom, and ability to uplift people. You is the most awesome superhero ever (*hug*).