I'd just run away and post about it in Vizzed.

I would use a plasma gun and melt them to down to nothing.P.S Plasma is millions of degrees Fahrenheit.

I would propably go all Super Saiyan on their buts. I could also evolve into a a big, ferocious monsster, with wings. I would also throw fireballs at them. Later, I would use my Almighty Sword Of Doom to destory them . I would also call Charizard out to tell them to FireBlast them.

I'd use an Ice Wall to freeze em all and then I'd use a Fire Wall to melt them all down to nothing.

I'd tell them I wasn't the right guy, I have a twin. While they were checking to see if I was, I'd whip out my machete and chop them all up into sushi!

all yu have to do is go into some light, everyone knows ninjas are ppowerless in the light. then with my samuri powers i would destroy evey single one of them.
ninjas dnt mess with me muahaha

i would kill them with fire a pikachu to use volt takle

First I would think their idiots for attacking a highly trained and educated kid that has nothing for them to gain anyways.... keep in mind I would not KILL any of them! just put them on a hospital bed for the rest of their life at most!

well, lets say there are only 5 attacking me. the first ones easy(the others hold back thinking I'm no problem), When he starts to draw his sword I quickly snap the arm and grab the sword myself. now they are all still standing and I say "You don't want to fight me!" Now since it would be no fun for them to give up now we shall assume they still DO want to fight me. 2 would then rush me. I would parry the fist one while kicking the other in some place he can't currently block. then counter the first slicing the shoulder, gut, or calf depending on the attack he used. then I simply slice at the other. HOPEFULLY he's good enough to block this, I would then raise my sword to defend my head(I know that would be the place that APPEARED open) duck beneath both swords and then slice his gut( not initially fatal, he's got a good long time before he bleeds out or gets help)! the last one I simply instruct to tell the employer what happened.

And that's how to defeat a small band of ninjas. and yes I do think about this sort of stuff often. thank you if you actually read all of that! it was fun to write!