I am applying for Haoshoku Haki and Haoshoku Infusion for Heidrun Thrymr. He possesses many kingly traits, including his standing as a Yonko, the King of Elbaf, and the captain of the Ragnarok Pirates. By this point in time, the military of Elbaf and the Ragnarok Crew are unofficially tied together as he lords over both.

Thrymr has been around for a good long while. Much of his early pirating career would have been liberating slaves and such, bringing him into conflict with local nobles and Marines around the globe. Eventually, his trips would lead him back home to Elbaf. The previous royal family lacked a proper heir, so Elbaf would allow giants to fight for the throne - with Thrymr coming out the strongest and most capable of the group. While his strength as a giant is impressive, his spirit would be pushed greatly as he fought Haki users and would develop those skills as well.

Given his giant lifespan, Thrymr would have numerous years to continue to hone his skills. His primary way of fighting is with his spear Gungnir, which would be the beacon for both his Busoshoku Haki and how he uses the Soru Soru no Mi. As such, he has a knack for infusing power into the tool, which would lead to him learning to infuse Hao into it for the deadliest of fights.