...I didn't even think of getting something that glows. But now that you mention it...I'm going to look into glowing things XD
But assuming my want for glowing Digi-Soul (or whatever it's called in Frontier) fades, the acetate suggestion works.
Mugen (Samurai Champloo) | Davis (Digimon Adventure 02) | Izaya (DRRR) | Takuya (Digimon Frontier) | Sokka [Book One ver, and Wolf Armor ver] (Avatar: The Last Airbender) | Firion (Final Fantasy II)
Ryo (Digimon Tamers) | Kassim (Magi) | Alibaba (Magi) | Matthew (Fire Emblem) | Male!Yang (RWBY)