Harold (also known as Father) is a character on Rapunzel's Tangled Adventure.
In Freebird, Rapunzel and Cassandra travel deep into a neighboring forest on their journey and run into Father and Mother. Both characters show that they can turn into birds with magical tea and can release the transformation with the breaking of a special egg. We are unsure of the actual relationship between Father and Mother but they travel together searching for people that they can change into birds forever and they're most likely husband and wife.
His bird form appears to be a cockatoo.
Father's Bird Form