Kinetic, you're arguing a moot point. Storyline wise, Shiek is unimportant.
I agree with this to a degree. What I'm saying is that the character adds more interest, and people like the character. Not her importance.
Sheik was important to the story, just not in a way you would expect in games now days. It's older afterall - and most games in that day were similar.
There is barely story as it is in Zelda games which is why it may seem so increadibly insignificant nowdays. Zelda stories have always been simple, neat, and to the point. THere was no need for HUGE character revelations and big roles otherwize it's stops being Zelda and becomes MGS. The fact that Sheik stayed out of the way and didn't interfere with you to a great degree is ZELDA FORMULA. Gameplay over story, that's all it is.
TP was the first Zelda that really had anything of a story if you ask me. And when I say story in this post I refer to story-telling and methods, of course, as the ACTUAL legend of Zelda and timeline kicks ***, and makes me feel warm inside.
Sheik was intentionally not supposed to be that huge of a factor, but you can NOT say she was totally unimportant and served no purpose. She did what needed to be done, and she added a new character we've never seen/considered, and helped add to that great OoT experience.
I remember playing this game as a lad of 11 (ish) and thinking "Woah who IS this Sheik" and when I realized it was Zelda I remember I was so shocked and pleased. I though (no lie) "That's "PERFECT"... it made total sense. If you're playing the game and picking out every machanic and criticizing every action, then don't bother, you're ruining the magic. Sheik is to me, quite magical indeed.
I believe in my heart, that Sakurai understands this.