They may not be names familiar to some YEP readers.
But for children of a certain age, the likes of Justin Fletcher and Mr Bloom are figures of wonder whose presence on a television screen is guaranteed to give any parent a few minutes of much-deserved quiet time.
Both were present for the opening day of the Geronimo Festival today at Harewood House, the first of two days of family-themed fun and the first time the event has graced Yorkshire.
The popularity of the entertainers was so high that the first day was a complete sell out in advance, with all tickets having been snapped up.
The day got off to a difficult start, with blustery and rainy conditions not quite the ideal conditions for a family day out.
However, the excitement generated by hundreds of children atop their mum and dad’s shoulders as Mr Bloom arrived on stage was enough to warm any heart.
Among those attending were James Bower, 32 and from Huddersfield with his two sons Phil and Vincent, five and three respectively.
“Mr Tumble is both of these two guys’ hero. They couldn’t believe it this morning when I told them they were going to see him in the flesh as it were.
“It’s good that Geronimo has come to Yorkshire. It’s usually in Manchester, I gather, so anything to bring the kids to the better.”
A big hit with the children were the animals on show, with donkey rides popular all day and big queues forming to allow youngsters the chance to meet giant tortoises, some as heavy as 23 stone.
The event was not entirely a success, with reports of long queues entering the festival site and for food and toilets on the site. There also appeared to be an issue with capacity, with some of tent-based activities full for much of the day.
Many took to social media to voice their disappointment and organisers did acknowledge that some food vendors had failed to turn up, as well as issues with traffic management.
Congestion for the Geronimo Festival is expected to be better tomorrow as fewer tickets have been sold.
Tier One tickets have sold out, but £40 Tier Two tickets can still be bought from the festival’s website.
The event – which is backed by the Yorkshire Evening Post – will support Cancer Research UK Kids and Teens, which funds research into cancers affecting young people.
Thousands of people are expected to attend over the two days.