I'm naming 2 of my sons after Gravitation characters. "Meet my sons, Ryuichi and Shuichi!"
I dunno... Vincent is plausible because it sounds so dang cool. Yuna is a real Japanese name but I wouldn't use it. Lessee here...
"This my child, Sephiroth Smith, he's starting kindergarten this year. Please keep him away from sharp objects, he was recently diagnosed with Take-Over-The-World-AndDestroy-Everythingitis."