Sodachi Oikura is a supporting character in the Monogatari Series, specifically featured in the 'Owarimonogatari' arc. She is a former classmate of Koyomi Araragi and is known for her sharp intellect and troubled past. Sodachi's character is central to unraveling mysteries from Araragi's middle school years. Her strained relationship with Araragi, stemming from misunderstandings and emotional pain, adds depth to the story's exploration of trauma, forgiveness, and the complexities of human relationships.