Her past isn't necessarily what you'd call mysterious. She doesn't gripe about it, and so no one pries. Essentially, she's your angst-free, fun-loving, adventurer-explorer. No vigilantism here. If I had to compare her to anything, it would be like if Tintin listened to Le Tigre and joined the Fantastic Four. She's excitable, passionate, attentive, curious, and caring. Like Captain Marvel, she's just a really powerful kid.

One thing I wanted to do, but would've got shot down by my friends if we pursued this, is that she prefers not to use her powers incredibly often. Part the appeal for her of this ongoing, infinite adventuring is the thrill of the challenge. When she uses her powers, in any capacity, be it big or small, it shouldn't be used often. She'd rather duke it out. Of course, there's no saying what or who she might "borrow" from another dimension, or what knowledge another one of her selves has gained which may come in handy.

I envisioned her as the sort of person who wouldn't use a cheat code while playing a video game. So, anything from her bag of tricks (borrowed from herself from another dimension) would be on her person already, before the shit hit the fan. She wouldn't use it as an instant cop-out, thus enabling her to get in trouble with no seemingly way out but wht she has on hand. Therefore, her powers, vast as they are, are constrained by her personality, which doesn't allow her to "cheat."

Basically, she'll use her powers only against threats of an equal or greater force. She wouldn't use them against common thugs, but might use them against Satan, or Galactus, or someonw equally powerful.