This version of Earth C may or may not be canon. I lost track of where I landed in Homestuck and have basic ideas of what happened, but can you blame a guy for not wanting to start all over again? Homestuck is too long for that. So, anything said here is not me saying 'this is canon', this is me saying 'I don't where what is happening with the story anymore but I'm going to make it work somehow'.
We all know the story of the kids and trolls becoming gods and beating the game, then creating Earth C and fast-forwarding 7000 years into the future. This is where my ideas may diverge from canon.
The human kingdom and the troll kingdom are both tightly-knit and segregated at the same time. Trolls are nocturnal, so humans don't even really run into trolls unless it's 9pm (for the trolls, their 8am most likely). With this in mind, there are no school systems that have co-existing troll and human students. However, there are some jobs who have troll and human workers. 24/7 places like gas stations, bars, busses, etc.
With all this in mind, human and troll relationships aren't frowned upon, but they're often seen as strange. Takes a lot to be in a relationship with someone who has a different sleep cycle than you do, after all.
Trivve grew up in quiet town in the mountains, mostly with just himself and his lusus Nea. However, young trolls living by themselves in such a manner was starting to be looked down upon, and Trivve soon found himself in a troll adoption facility at the age of twelve. He would be adopted at fifteen by troll parents. Instead of living in another quiet town, he was instead brought to a suburban neighborhood that bordered troll and human territories. To adjust to this new lifestyle, he became diurnal (active during the day) and went into public schooling.
Even though it's a major environment shift for him, he accepts it and does his best to get used to it along with his family. It's hard for him to make friends at first with humans with how rowdy he is, but he toned down his rough-housing and instead took up playing games with the neighborhood kids. Soccer is his favorite, but he also played football, basketball, tennis, etc.
Now at 18, he is close to graduating and moving out of his home hive, since trolls usually move out after high school if they can. He dreams of going back to where he used to live and returning to his old roots, but still wants to keep in touch with the friends he's made in the 'big city'.
Trivve is a very rambunctious troll who does a lot of playfighting with others to get out excess energy. If he has too much energy, it will show towards his actions in ways of fidgeting or shifting from foot-to-foot.
Even though some consider him 'uwu big strong boy', he is still very much a rowdy guy. Social cues, especially when it isn't with trolls, can fall flat on him. He does his best to understand, but some consider him stupid because of simple misunderstandings.
