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His audience, who dressed up as their favourite book characters, included a smattering of cows, Red Riding Hoods and several girls with dragon tattoos.
Dr Glam, alias University of Otago lecturer Ian Chapman, used the opportunity to encourage pupils to be themselves and not put with bullying.
He said he lost confidence after being bullied as a child, and only regained it when he developed the character of Dr Glam.
"Ever since I was a child, I dreamed of becoming an author or a rock star. It was what I knew I wanted to be."
Although he was aware not everyone could develop an alter ego, he hoped he could encourage more confidence in young people.
"Don't put up with bullying. Do something about it. Never give up on your dream, because you are unique."