Harold takes pride in the fact he's one of the few helicopters in Crotoonia, in fact he once claimed that engines were not very useful and quite out of date. But after losing a race against Percy, he had a change of heart. All the same, he is a reliable and tactical rescue helicopter who, along with Budgie, keeps a bird's eye view on Crotoonia and is relied on to keep everyone safe.
Harold is based on a Sikorsky S-55 helicopter (also known as Sikorsky H-19 Chickasaw), built in the UK as the Westland Whirlwind. He has added floats. Around 70 of these still survive in some form.
Harold is painted white with red lining. His name is painted on his sides, near his tail, in red.