"Blind" Ivan is the former leader of the Blind Eye Society. He currently works as a traveling banjo minstrel by the name Toot-Toot McBumbersnazzle.
Prior to the arrival Dipper and Mabel in Gravity Falls, Ivan joined the ranks of the Blind Eye Society as a means of both keeping the supernatural secrets of the town hidden and suppressing his regretful memories. He eventually gained the status as leader of the organization, albeit more malicious and conniving than that of his predecessor, Fiddleford McGucket.
In "Society of the Blind Eye," Ivan oversees the erasing of Lazy Susan's memories after she discovers Gravity Falls' population of gnomes. When Dipper, Mabel, Soos, Wendy and Old Man McGucket learn of the society's intentions, he later takes part in a manhunt to capture and warp the group's memories of their summer, however he is defeated by McGucket, who has grown immune to the device's effects due to his fractured psyche. Ultimately, Dipper resolves to ironically erase Ivan and the other society member's memories of the existence of the Blind Eye Society, with Ivan's deep ties in the organization causing him to suffer long-term memory loss. Having lost complete knowledge of his identity, Mabel convinces him he is a traveling banjo minstrel named "Toot-Toot McBumbersnazzle," a role that Ivan happily adapts to by singing his name with joy and pride.
Ivan is a mysterious character who prefers to keep his identity a secret, trusting only fellow Blind Eye Society members. While Ivan claims the society does good, he demonstrates numerous less than ideal traits. For example, he is extremely irritable and cocky, which often backfires on him, and he is ruthless in protecting the Society's secrets. He prefers to ignore difficult thoughts, including guilt, and erases such thoughts from his mind. It seems that his entire being revolves around the Society, to the point where he literally forgets who he is when his memory is erased and becomes a highly impressionable, blissful simpleton after this.
Ivan is a thin man, with a gaunt skeletal face. His right eye is pink and has a red X over it. He is bald and has tattoos on his head. The tattoos resemble phrenology maps and includes sections for: color, size, form, weight (the four of which make out his brow ridge), stress, time, fear, bias, knowledge (which Mabel rewrites as "butts"), morals, snacks, hope, the ladies, mom, denial, dreams, creativity, reflex, ID, and cats.
"You shouldn't have come here. We do not give up our secrets lightly."
"As you no doubt discovered, Gravity Falls is a town plagued with supernatural strangeness. No one knew how to stop the things that went bump in the night. So, our founder invented the next best thing: a way for us to forget. We took it upon ourselves to help the troubled townsfolk by erasing the memories of the strange things they've seen. Now the people of Gravity Falls go about their lives ignorant and happy, thanks to us. And, as a perk, we help ourselves forget things that trouble us. Everyone has something they'd rather forget."
"End of the line. By tomorrow, this will all seem like a bad dream. Say goodbye to your summer!"
"Yes! I am Toot-Toot McBumbersnazzle! (singing) Toot-Toot is my name!"
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