You fight Gorai and Datara at the Top of Tempest Tower. I suggest getting rid of the two Wind Gods first, then take out Gorai (if you take out Datara before Gorai he will just revive himself during the battle), then unleash all you attacks on Datara (don't forget to heal your team if needed though).
Deniva does not mean anything in Japanese.
"Olga" is not a Japanese word or name, so it doesn't mean anything at all in Japanese. Did you mean, "What is the name "Olga" translated to in Japanese?"
Kaitlyn does not mean anything in Japanese, but can be written in Japanese as: ケイトリン
The name 'Collin' does not mean anything in Japanese, but it can be written in Japanese as: コリン
This does not mean anything in Japanese.
It does not mean anything in Japanese, but it can be written: ビンセント
what does it mean in English and I'll find out what it means in Japanese for you
Krystle does not mean anything in Japanese, but can be written: クリスタル
It does not mean anything in Japanese, but can be written: マーラナ
The name Tony does not mean anything in Japanese, but can be written: トニー
The name Sandy does not mean anything in Japanese, but can be written: サンディー