Hi, all!

I need a little help on describing Akane in my FanFic. I noticed from the 
TV series that her hair isn't black like Ranma or Ryoga's but more like a 
dark blue. Is it me, my TV or just true? Also, I believe that Shampoo's 
hair is blue. Again, is it me, my TV or true? My friend says it's 
bluish-purplish.

Could any of you also clear up on what each of these term that they use are?
Also who uses and says them while fighting?

Kachuu-Tenshin-Amaguriken
Bakusai Tenketsu
Shiki Hakoda
Mouko Takabishya

Thanks!