Haredas

Haredas is an old man who lives in Weatheria. In the anime, Haredas uses a technique in the form of a bubble-like barrier that allows him to be unfazed by the extreme weather while walking in Weatheria. Whether this is some new (or old) technique or possibly a type of technology native to the sky islands is unknown at this time.

Personality
Haredas has shown to have a rather carefree upbeat personality, smiling and seemingly enjoying himself mostly. He is also slightly absent minded and bumbling. Despite this, he is a genius inventor, creating new forms of weather technology and ending drought to countries and creating cotton candy clouds.

Weatheria Mini Arc
Haredas first appears when Nami ends up on Weatheria, due to the events of Sabody Archipelago. He takes Nami in, promising her to return her to Sabody Archipelago but that it will take some time to get there. He offers her some cotton candy cloud he made, which latches onto her face and almost suffocates her to death, much to his surprise. He shows her around the island, and takes her with him when he travels to the ground level, showing her how to use the wind knot to bring rain and climate changes. He had spoken with the mayor of the island to arrange her to stay and travel back to where she came from, but she instead asks to stay with him until Weatheria comes near Sabody Archipelago. He happily agrees.

Nami
He has formed a master-apprentice relationship with Nami, ever since she was sent there by Bartholomew Kuma. Despite him making bumbling mistakes like blowing her up with a thundercloud and suffocating her with a cotton candy cloud, they get along well.

Trivia

 * He somewhat resembles popular depictions of Merlin and most notable, Nami is commonly compared to a "witch" while Haredas resembles a wizard.