All you have to do, is to place a Link Player Block above the NPC, that can be spin-jumped on (Spiny, Piranha Plant, etc.). Then spin-jump into the block and when you will land on the NPC while Spin-jumping, it won't hurt you and you will continue Spin-jumping on it:
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Also, when he will be transformed into a Fairy and then back to normal, he still will be able to Spin-jump.
And last thing, Link loses his ability to Spin-jump after transforming into a Statue and then back to normal, but every other character does that too.



