depends
Ninja like we see here or real ninja
First option: I'd kick their ass/or die with a fight (most likly I'll be a ninja since I've been a practitioner in martial arts for 10 years of my life and replace martial arts with ninjutsu and I'd have a fair amount of genius I would say since I was the youngest to obtain a dan rank and have increased since then and I am highest of my classes. If we're dealing with Akatsuki and badass ninja I'd fight but probably die)
Second option: if ninja are back me into a corner, I'd pull out my nine and kill them. I ain't seen nobody dodge a bullet except for Superman and he just does that to show that he can lol jkjk I'd fight back and probably die, again I am a fairly skilled fighter (not to toot my own horn.)
If I had my sensei with me for either I'd feel a lot better because that mother F***er is 5'4'' of pure WOOP ASS and 150lbs of badass speed and power. I've never been more afraid of a short man in my life (with the exception of my dad who is just like my sensei but less skilled...I think my dad is Yondan in...Shotokan or something else I forgot) either way i'd feel safe with either.