" When worn, only the chosen holder of the relic can take off the key when it is being worn in any fashion. "
This bit is the one that immediately strikes us as least plausible about the character. 

We'd also say you should have some sort of ability beyond unnatural wanderlust, some sort of tangible goal or some ability that makes her unique or somehow superior to regular people. It doesn't have to be powerful. Right now she's not really all that different from any other person. There's nothing making her more powerful.

The clothes on the image seem a bit modern/futuristic, but thats a minor detail.

Blox: right now, with Sparks dropping out, a reboot of sorts is being discussed.