It was I

A green fish-like character in a white shirt holds a gun, facing a character with a large, exaggerated head, while a smaller character with blonde hair appears in a circular inset; the scene transitions to the fish-like character sitting in a red chair, watching a television that displays a close-up of a man with spiky blonde hair shouting, with subtitles reading "I thought not. So now, Jojo can't be your first!" and "It was me, Dio!"