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You know, for the event to always be under the hero, so you could walk on top of it and stuff. It could be activated by parallel processing or any other way, as long as it works. I'm using RPG Maker XP.
I'm not sure about what you're trying to do, but if you're trying to toogle the Under Hero flag, then you could simply make another event page with this paramater on and switch between event pages.
Seeing as you ALREADY HAVE A TOPIC ABOUT THIS IN SCRIPT REQUESTS and THIS IS IN ITSELF A SCRIPT REQUEST I'm locking this. Don't make multiple request topics about the same thing.