Where do you want to start? Bellingham has a unique profile for a player his age, an exciting blend of technical prowess, physicality and composure.
"His natural flair was something that stood out from very early on," Harrison added when GOAL asked about Bellingham's standout qualities.
"Whether that be in his smart ball retention through drag backs or his ability to receive the ball on the half-turn almost anywhere on the pitch and not look pressured in doing so. His biggest assets for me personally are the intangible ones that aren't coachable, his overall awareness and reading of the game are far superior to the average teenager and he has a real knack of popping up in the right place for Sunderland at times this season."
It's easy to see these strengths for yourself if you watch Bellingham in the flesh. It's scary how composed he is in possession considering his limited top-level experience. His physical presence is something to behold too.
Standing five centimetres taller than his brother Jube and filling out significantly since his professional debut, Bellingham can hold off a challenge and win the ball in the air. Team-mate Neil gave a pretty neat summation after his maiden brace against Rotherham, describing him as "an absolute freak of nature, physically."
He added: "Technically, he is a top, top, player as well. He has come here to play in front of 40,000 every week and that is something he is going to have to take on mentally, because we can all see how good a player he is technically, physically, and tactically. It is a different kettle of fish playing up here in front of these fans, but from what I've seen of his personality, he'll take it on just fine."
Bellingham's comfort with playing in front of 40,000+ supporters every week speaks to his incredible maturity. After netting that winner against Leeds, he was put up for media duties and spoke like someone with a decade's experience in the game, calmly analysing the game from a tactical perspective and transmitting leadership skills that also defy his tender years.