It might not have a huge impact on their relationship on the Quidditch team. They are both dedicated to the sport. Oliver's weight might not matter much when it comes to flying skills. Harry could still be the star Seeker, and Oliver could focus on his role as Keeper. They would respect each other's abilities and work together towards winning the Quidditch Cup, regardless of the weight difference.
The weight difference could also lead to a more balanced friendship. Oliver's heftier build might mean he is more stable, both physically and emotionally. Harry, who might be seen as more slender or wiry, could rely on Oliver's sturdiness in different ways, like when they are working together on a project or facing a common enemy. Oliver's greater mass could be a symbol of his reliability in their relationship.
Well, it could lead to some friendly teasing. Oliver might be a bit self - conscious about his weight and Percy could make light - hearted jokes about it, which would strengthen their bond in a way. Or it could be the opposite, and Percy's comments could cause some tension between them.
Maybe it's because Oliver Wood is more muscular. He's a Quidditch player and all that physical training might have built up his muscle mass more than Percy, who is more into academic and administrative work. So the difference in their body composition could lead to Oliver being much heavier.
Another aspect could be related to his age and growth pattern. If in the fanfic's universe, Oliver has gone through a growth spurt earlier than Harry and has filled out more. His body could have developed more mass in terms of both muscle and some extra fat as he entered adulthood or a more mature stage of growth before Harry did.
It could lead to some friendly teasing. Percy, being a bit more proper, might be slightly amused or bemused by Oliver's heftier build. Oliver, on the other hand, might not care much and just see it as part of who he is.
Well, it could be just a random physical characteristic given for comical effect. Maybe the author wanted to create a contrast between Oliver Wood's more solid, perhaps muscular build compared to Percy Potter. It might also be used as a way to emphasize Oliver's presence or strength in a humorous way.
I'm not sure specifically which fanfic this refers to. But generally, if in a fanfic Oliver Wood is heavier than Percy, it could be shown through physical descriptions. For example, when they are standing side by side, the author might describe how Oliver's frame is broader and more solid - perhaps he fills out his Quidditch robes more fully compared to Percy. Or when they are participating in some physical activity like climbing stairs, Oliver might be shown to be a bit slower or more out - of - breath due to his extra weight.
Oliver might have a training regimen that includes a lot of core strengthening exercises. This would help him balance better while flying, given his heavier build. He could also practice with heavier brooms to get used to the extra weight. Harry's training would likely be centered around reaction time. He'd want to be able to quickly change direction in the air. So he might do a lot of drills where he has to respond to sudden signals or movements.
One possible reason could be different lifestyles. Oliver, being so focused on Quidditch, might have a diet that consists of more hearty and filling foods to keep his energy up during practices and games. Percy, on the other hand, might be more into lighter, more 'intellectual' meals as he is often buried in books and administrative tasks. This difference in diet could lead to Oliver being heavier.
It develops in a complex way. There's a lot of mutual understanding and support growing between them.