Actually Roxas's hair color tend to change too much. In the official artwork his hair is yellow-gold blonde, just like the usual blonde. In the 3D game render it's golden blonde, as gold as a pure gold ore, kinda close to chestnut blonde. In the high polygonal 3D render (the one used in the openings of Kingdom Hearts games) it's also yellow-gold blonde, the usual blonde.
Woah… I'm so confused. It looks like you DREW this but it looks exactly like in the game… the coloring, shading and all… but it doesn't look like those kind of graphics, it looks like a drawing. That's neat. C: