ju go o
Nine tails is Kyuubi
there is no such thing as multi shadow tails. you can't just make up random phrases and expect them to be translated to japanese.
Tails. In the Japanese version, they even make him say, "I love you," to her.
ju-go
The phrase 'ten tails' would be 十本のしっぽ (juppon no shippo) in Japanese. However, the word十尾 (juubi) has been used in the anime 'Naruto' to refer to a demon called 'Ten Tails'. I wouldn't recommend using this word, as it could also mean 'ten small fish'.
Fifteen is "quinze" in French.
Fifteen in Welsh is "Un deg pump"
Cosmo appeared as a hologram after she sacrificed herself for the universe, and came and "kissed" Tails as she disappeared. She appeared possibly by telepathy. Cosmo and Tails were an official couple, too.
15.515 = fifteen and five hundred fifteen thousandths.
Filipino translation of fifteen: labing lima
Fifteen trillion.
It is spelled jyuu-go.