There are of course Japanese words for 'black', 'rose' and 'dragon', but the Yu-Gi-Oh monster 'Black Rose Dragon's Japanese name is actually in English.
They gave it a name using English words which can be first romanised into Japanese phonetics - 'Burakku Rōzu Doragon', and then into Japanese kana - 'ブラック・ローズ・ドラゴン'
You could say something like 'Kurorōzu no Ryu' but that isn't the name Black Rose Dragon would be known by in Japan.
Kuroi is pronounced "koo-roe-ee."
Taiyou, you should pronounce it something like Ta e yoo
to
Nabigeetaa.
Steevann
kore
washi
osutoraria
tsuki
maikaru
"Omosa."
yoru