初試合 / The First Match
ふひひ、GENEの動きは完璧だね！
あんなヒューマノイドを造っちゃうなんて、さっすが天才科学者のボク！
Fwahaha, GENE's movements are perfection! Only a genius scientist like me could construct such a Humanoid!
The original Rikka laugh is “fuhihi”, which sounds more cunning.
Rikka refers to herself as “boku”, which is normally for males, so this is another instant stereotype set up by a language feature that English could not do. Japanese players will understand right away that this character is a “boku-girl” and comes with all the expected bratty but lovable tropes.
あの選手がどのような演技を見せてくれるのか楽しみだよ。
しかし……あのギア……。
I'm looking forward to seeing her performance. But there's something about that Gear...
どうしたのぶちょー？
What's wrong, Captain?
男の浪漫……だな。
It's just that...boys love toys, you know?
Rouman 浪漫 is the “romance” of boys, and I think manga often use just that to convey it.
――はい！ わかりました！
うっし、やるぜ～～。
I understand! All right, let's do this!
Kakeru says “usshi” the same way “yosh” works when he hypes himself up.
レッツ！ グルーヴコースター！
Time to groove!
Again, I think I’d love it if they used LET’S! GROOVE COASTER! exactly, even when the grammar is weird.