The strongest idea here begins with something wonderfully concrete: measuring the Forgotten Man through collision boundaries and comparing that result with known character sprites. The process starts as an attempt to test Papyrus, uses Kris and another sprite to estimate the hidden figure at roughly 53 pixels tall, and eventually lands on Mystery Man’s expanded interaction sprite at the same height. It is an inventive way to turn an obscure visual detail into a testable clue, and the fact that the initial Papyrus hypothesis fails makes the investigation feel more genuine than simply working backward from a preferred answer.

That pixel match, however, is much better as a starting point than as proof. The video treats the 53-pixel correspondence as unusually significant because other examined Undertale and Deltarune sprites do not match it, but sprite dimensions can reflect animation, posture, or design needs rather than canonical physical identity. Mystery Man only reaches the target height in the alternate sprite shown after interaction, requiring an explanation for why that particular pose should be compared with the Forgotten Man. The proposed answer—that he would be excited to encounter Kris—is imaginative, but it illustrates how quickly the theory moves from measurable evidence into interpretation.

The broader Mystery Man/Gaster case is considerably more substantial. The video gathers the recurring association with sixes and FUN values, the Gaster followers’ dialogue about being shattered across time and space, unusual phone behavior, Mystery Man’s disappearance, and the repeated “man” terminology surrounding Deltarune’s secret encounters. The Yume Nikki comparison is especially interesting because the argument does more than point out a visual resemblance between Uboa and Mystery Man: it also connects the unusual encounter mechanics with Toby Fox’s earlier Yume Nikki fan music and Deltarune’s “Man” tracks. None of this establishes the characters’ identities as fact, but the accumulation gives the theory a recognizable thematic framework rather than leaving it dependent on pixel counting.

The Forgotten Man’s recurring association with memory is where the argument becomes most cohesive. Characters repeatedly fail to remember who brought them somewhere, left something behind, or was looking for Kris, while the man himself worries about being forgotten. The video connects this pattern to Gaster’s apparent absence from ordinary Undertale awareness and interprets the eggs as fragments of a shattered Gaster. The observation that dropping an egg produces the forgetful “what egg?” response fits that interpretation particularly well. From there, hiding eggs throughout the Light World becomes a proposed reconstruction process, with the man’s increasingly direct Light World appearances presented as evidence that his presence is strengthening as more pieces are transferred.

The theory becomes much more speculative when it proposes two Gasters: a Deltarune counterpart responsible for the mysterious guiding voice and an Undertale Gaster who became the Forgotten Man. This is a clever attempt to reconcile evidence that otherwise appears contradictory, particularly the apparent hostility toward encountering the man despite Gaster-associated elements elsewhere seemingly guiding events. The two-world structure makes such a counterpart conceivable within the video’s logic, but the existence of two Gasters is still an assumption introduced largely to make competing clues compatible. Likewise, interpreting the two trees in the Roots imagery as representing two Gasters is possible symbolism rather than strong independent evidence.

The later reconstruction theory is imaginative but similarly dependent on several stacked inferences. Friend attacking after the Chapter 5 egg, dialogue about hiding protein, Noelle’s strange egg experience, and Friend’s presence around Cat Petterz material are assembled into an argument that Deltarune’s Gaster is hunting the Forgotten Man’s egg fragments to prevent his restoration. The video does acknowledge that its explanation for the conflict between the two proposed Gasters is loose, which is an important qualification. Even so, the presentation sometimes moves from intriguing correspondence to confident conclusion faster than the evidence warrants, especially when ambiguous imagery or mechanics are assigned very specific motives.

The attempted Wingdings reconstruction is an appropriate final example of both the video’s strengths and limitations. Reading the man’s waves, pointing, palm gestures, and smiles as literal “speaking in hands” creates a satisfying connection to the River Person’s famous clue, but converting those gestures into Wingdings produces no coherent message. Rather than pretending otherwise, the creator admits the mapping is ambiguous, reports the unsuccessful decoding, and asks viewers to investigate further. That openness helps preserve the theory’s playful investigative spirit. The video ultimately succeeds less by definitively identifying the Forgotten Man than by connecting pixels, eggs, memory, secret rooms, FUN values, hands, and cross-game imagery into an unusually elaborate interpretation worth considering.

Pros

• The 53-pixel investigation provides a concrete and inventive starting point rather than relying entirely on thematic similarities.
• Failed consideration of Papyrus naturally leads into the Mystery Man hypothesis instead of being concealed or ignored.
• Recurring forgetting, disappearing characters, egg behavior, and Gaster’s shattered existence are combined into a cohesive thematic argument.
• The Yume Nikki/Uboa discussion connects visual resemblance, encounter mechanics, and Toby Fox-related music in an especially interesting chain of observations.
• The egg-fragment interpretation gives the Forgotten Man’s repeated gifts and Light World appearances a clear proposed purpose.
• The creator openly identifies weaker portions of the argument and acknowledges when the attempted Wingdings decoding does not produce a convincing result.

Cons

• Matching sprite height is treated as more significant than the evidence can establish, particularly because the match requires Mystery Man’s alternate pose.
• Several later conclusions depend on speculative interpretations being stacked on top of earlier speculative interpretations.
• The two-Gaster explanation conveniently resolves contradictions but lacks evidence as direct as the video’s stronger memory and egg observations.
• Symbolic readings of the Roots imagery, Friend’s behavior, and character motivations occasionally become more confident than their ambiguity supports.
• Subscription and Discord interruptions break the momentum of an otherwise detailed investigation.
• The Wingdings gesture theory remains unresolved and therefore functions more as an intriguing lead than supporting evidence.

A surprisingly rigorous pixel experiment opens the door to a much larger theory whose best evidence comes from recurring patterns of forgetting, fragmentation, eggs, secret encounters, and Gaster-associated imagery. The argument becomes increasingly speculative once it introduces two Gasters and a conflict over reconstructing one of them, but the creator generally distinguishes the strongest connections from the unresolved leaps, making the rabbit hole engaging even when its ultimate conclusion remains unproven.