Make interesting backstories!

[denthor]

I mean you realize there is nothing stopping you from going full Star Wars. Why should the Elf be some random child being experimented on, if she could instead be the wizards daughter, who he wanted to imbue with great power. You can leave it open till the very end if the wizard or the guy who rescued/abducted her was the bad guy. Maybe the person she was with as a child was the wizards assistant saving her from a fate he deemed worse than death (but which might not have been), or maybe he wanted her power for himself...

Cliche bonus points if it turns out at the very end that she did in fact get imbued with some nascent power, and the solution to solving the situation was 'inside her all along'...

How very Naruto a child with no parents imbued with great power.