[quote=@pandapolio]
[@Neo Is Delight]  Thank you for telling me that.  I actually have not seen Korra in the longest time, guess I should watch that after I watch last airbender.  I would say Hideki's power is fueled by his drive for more power and to master every aspect of firebending.  What color would you guys say that is?
[/quote]

Red, Purple, maybe even blue like Azula's. 

Purple most likely because Purple is a shade of red and blue. Red is the drive, red is probably that anger you're talking about when Hideki gets mad. Red is passion and often an energizing color. While Blue is a calmer color, it is eccentric, it is that drive and will we were talking about Azula. Purple is both passion, it is the mystery of blue, and often the color that best attracts those eccentric and creative minds.

Just some of my thoughts though.