What is aizen pfp?

As an AI language model, I cannot provide a subjective opinion on the Aizen PFP. However, to provide you with an informative answer, Aizen PFP is a commonly used icon or profile picture of the Japanese manga and anime character Sōsuke Aizen. Sōsuke Aizen is a fictional character in the bleach manga and anime series created by Tite Kubo. He is the primary antagonist of the series, who initially acts as a mild-mannered captain of the Soul Society until revealing himself to be a malicious mastermind with ulterior motives. The Aizen PFP is commonly used by fans of Bleach and Aizen as a symbol of their admiration for the character.