Mono and Six did not met by chance (or so I think) both of them were meant to replace the heart of a location 📍
Six - The Lady - The Maw
Mono - Thinman - The Signal Tower
The Signal tower is unable to exist without a Thinman. Just as the Maw can't exist without a Lady.
Both Mono and Six were the chosen ones to take their respective places.
That is why Thinman always got to find Mono, and Mono went unconsciously searching for Thinman, Thinman was looking for his sucesor.
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Little Nightmares II Theories
FanfictionI will be sharing here some theories about this gorgeously terrific game <3