I was thinking maybe a vision similar to thermal, but that wouldn't be helpful to a nin xD

It could be if they were in complete darkness, or surveying an area? O:

Yea, But, If someone used a fire jutsu it would be useless xD

That is true XD

Hmm, I will make something up that works..

I'm thinking of my bloodline being somewhere along the lines of a blood user O:

I was actually thinking that at one point, because my character uses a plasma justu, which is related to blood.. hmm..

Lol, maybe that could be a reason they don't like each other? XD

Because they share similar jutsu?

Yes, lol. Then it wouldn't exactly be 'unique' to them O:

Maybe... I am not so sure about that I need to think on this..

Alright, let me know XD