how high are the chances of this being a Highlander (Casual) skin in the future?

>>532517761
thats a nice Nozomi

Time Travelers, I think I love this brat, and since im new I have no idea about what her perfect team looks like. Outside of her sister, is there a Unit that is mandatory for optimizing Nozomi?
can they be farmed/bought with the 3star selector?