[quote=The Kid Lantern]
It never took control of somebody's body in the comics, and it sure as hell didn't attach itself to Zatara for any length of time. I mean if whomever was under the helmet couldn't just let Nabu instruct them how to do stuff they'd let him take control momentarily. But it never lasted long...~KL~
[/quote]

In the Young Justice TV Show Zatara was so afraid for his daughter when the Helm of Nabu chose her that he practically forced the Helm of Nabu on to his own head to save her from it. Dr. Fate is treated as a totally different person from the host body as evidence when the Justice League had to vote whether or not to let Dr. Fate be a member of the team when Zatara was already a member.