Warning! SPOILERS for Halo.
As Halo continues to expand its own TV version of the games' story, the show may have hinted that a character from another live-action Halo production is canon. Despite still being early in the first season, Halo has already proven more than once that it will not follow events or game lore to the letter while building its own story. That said, the show has brought to the screen many hallowed elements of the franchise, including planets, species, and characters.
Even aside from Master Chief removing his helmet, how Halo is dealing with John-117 as a character is what is setting the show apart from the stories game players already knew. After turning on the UNSC following an unsettling order right at the beginning of the show, Master Chief was given a much more humane treatment when compared to the games. After returning to the UNSC premises, Master Chief is visibly changed from the experiences he's had recently, including finding the forerunner tech in Halo's Madrigal, one of which took place in a place that holds an Easter egg.
Related: Halo TV Show Has Rewritten Master Chief's Origin Story
During his stay at Reach, John passed a place called Tchakova Park, which may have been named after Halo: Forward Unto Dawn’s original character Dimah Tchakova. Tchakova was a cadet at UNSC Corbulo and came from a family with a long tradition in the navy, including a FLEETCOM secretary mother and a father who worked at the UNSC intelligence. A classmate of the film's protagonist, Thomas Lasky, Tchakova ended up dying after the orbital elevator she was in was shot down by a Covenant ship. Considering that Halo: Forward Unto Dawn takes place 26 years before The Fall of Reach — and by extension a similar time
Read more on screenrant.com