Despite his lack of sleep, Cranky works very hard. But his working attitude makes the engines cross whenever they think that Cranky is too slow - as a result of their insults, Cranky can cause accidents.
Although he is naturally grumpy, Cranky has shown that he has a kind side too. Once he helped Thomas out of trouble when he and Percy were playing "Hide and Peep" by finding Percy in the dry dock.
He has befriended a seagull that often visits him and has named it, rather fittingly, Seagull. Cranky is not fond of all animals though and is shown to have a fear of elephants.