"I'm dangling from the hip of the bloody Ghost of Sparta!" -Mimir, God of War 2018

Mimir is the Norse God of Knowledge and Wisdom and an ally of Kratos and Atreus. He was Odin's advisor and the ambassador of the Aesir Gods until Odin imprisoned him 109 years ago. He is the tritagonist in God of War (2018).

Mímir, meaning "the rememberer" or "the wise one" in Old Norse, is a figure in Norse Mythology who is renowned for his knowledge and wisdom. He is beheaded during the Æsir-Vanir War. Afterward, Odin carries around Mímir's head and it recites secret knowledge to him. 

(source: https://godofwar.fandom.com/wiki/Mimir)