There is no difference whether you are an astronomer or a ninja, a name is a name. But among what I have heard traditional names like 'gennosuke' , 'sousuke' , 'sasuke' , 'hanzou' , 'juubei' and the like have been the most repeated ones. (The 'suke' in the end of three first names is kanji for 'help', as ninjas were assistants to great samurais and governmental officials to do their bidding etc.)
Shinobi
Kuji-kiri
Hayai-Kage means swift shadow in Japanese ^-^
It's the same thing, Narutimate Hero is the Japanese name for Ultimate Ninja. Same thing
Sasuke's name doesn't really have an English translation, it comes the legendary ninja Sarutobi Sasuke which has become a typical ninja name.
In Japanese "pink" is ピンク (pinku) and "ninja" is 忍者 (ninja), so to say "Pink ninja" it is ピンク忍者 (pinku ninja).
ninjitsu, or ninja do
The word ninja is a noun, a word for a person skilled in ninjutsu, a traditional Japanese technique of espionage, characterized by stealthy movement and camouflage.Some synonyms for the noun ninja are:spyagentoperativespecialistinformerwatcher
Rebel (as a proper name) = レーベル
Yes
yes American ninja warrior does have Japanese contestants
Ninja is already Japanese. In English it is 'Shadow warrior', it is equivalent to assassin or secret agent.