[quote=BK201]
i dont want to kill the plot but,,,if humans enter the spirit world they would die unless they dont wear spirit clothes
[/quote]
That's why they were given spirit clothes. And why Al copied someone who was wearing them.

ALSO: Just a heads up, when Al scans a body, all physical aspects are perfectly mimicked. If the character is as physically strong as superman, and Al copies him, he will have the same strength. However, he cannot copy magical power, or any other non-physical aspect.