In Gundam X why does everyone want Tifa what's so special about her?

That's why all the powers want her

In W's worldview, new humans are already rare, and in the show, there were even artificially created pseudo-new humans

Plus the fact that she's got superpowers, plus the ability to activate the satellite's microwave cannon, makes her a natural target for everyone to grab

Tifa is the only one who has the ability to activate the satellite's microwave cannon.