guess who or what

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Can you tell what "I" am? Have fun~love love ninja

I always against you but keeps moving on. I can look  back but keeps going forward.I may be able to flip and change but i keep going stray on the high wire.if you dare try to change me I can efect you.I may end soner for some but I always end.you usually see me going around or when the blocks change.I love to fly and I'm different every place I go. You take me for granted but you should tresher me. What am I?

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