It's really hard to tell with such a tiny photo, so I'm assuming you just need a long two-tone wig with nothing extra like pony- or pig-tails. Arda has almost the exact thing with the Eva
, you'd just need to straighten the curls and that would get you some length, then add some bangs. If for whatever reason you don't like that you could try looking for "Monokuma" wigs from the Dangan Ronpa series but it seems the colors are opposite for that character so it may not really work.
If there's additional details I've missed we'll need a larger picture to see them.