It might have been for the sprite to go with the environment better. (Colour harmony?) If it had been brown or something, it would have looked bizarre (because the trim is also brown) and yellow might have stuck out too much.

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I K A R U G A
I am not alive, thus I can't die.
I won't give up even if my Ideal isn't fulfilled.
My will, just as my regrets, won't ever end


New Music Video - To Stay Myself - Twilight Princess