All doujin works are OK to make!
This includes, but is not limited to:

• CDs

• Keychains, stickers, other merchandise

• Posters, art prints, etc.

• Original songs

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R18 works are also okay.

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Things that are NOT OK to do:

• Create fan characters using May's image and/or voice

• Use her voice/image for commercial use

• Trace any of her images in any manner