I did panto with a fair few in the 90's/00's.
Madge and Harold from neighbours were both lovely.
She was the wicked queen in Snow White and she used to hide those ornamental wax apples in random places all over the theatre. You'd open your drawer in the dressing room, or pull back a curtain and there'd be a massive red apple sitting there. She was fab!
He always made sure to say thank you to the band after a show, which a lot of people don't, and was a real gent.
Brian Blessed was as you expect. Very loud, very funny, swore like a navvie, and was utterly lovely to everyone. He bought all the cast and crew little Christmas presents.
Wizadora (anyone remember her?) was utterly vile. She threw an iron at one of the crew when he knocked on her door to give her 15 minute call.
Jim Davidson used to do a couple of nights at the theatre every summer, and after the first two the theatre insisted that only male staff work back stage. Complete wanker.
Terry Pratchett used to come to a Christmas concert every year that my mum and I also attend. He would remember us year to year, and would comment on how I'd grown etc. He was lovely, and it was the most bizarre feeling being at the concert this year without him 