The R. Twins
William R. He's not always too keen on giving his whole last name as it's quite long and its translation in its original language isn't a nice one. So, R. it is.
He's a pretty quiet person most of the time, but that's usually because his brother is hogging the center of attention. To make matters worse, the brothers go to the same school and share a lot of classes. This would be because they are twins, identical actually. Giles R. is the man of the spotlight. (So, yes, they are Will and Gil. Aren't parents so kind with name choices?)
Anyway, William isn't resentful of his brother at all. He quite prefers fading into the crowd. He will gladly let Giles talk everyone's ears off if it means no one is looking at him for an extended amount of time.
William and Giles are always together, always. So, they decided amongst themselves that they would each have a "thing" that could help others differentiate them. William keeps his hair long and messy along with wearing hats most of the time, and Giles has his hair quite short and usually wears hooded jackets. This way they don't have to deal with others's confusion.
Since we're on the tangent of appearance, let's give some more details. They've both got light brown hair to the extent that some people think it's blond, but it isn't. They're fairly pale, but they don't have freckles. William is a little taller than Giles, but only by a few centimeters (an inch or so). They're both fairly lanky, so the height and hair are their only real distinguishing traits. That's about it for descriptions without getting stupid detailed.
William enjoys reading and tennis. Giles doesn't much care for solitary sports or libraries, but he's always there with William anyway. In turn, William can be seen at all of Giles' football (soccer) matches as well as at weekend get-togethers.
Although the twins may seem too close to come between, they do hang out with a group of five, including themselves. Dan, Georgia, and Morgan are the other three. The five are close and have good times together. But at the end of the day, William and Giles have known each other since birth and share a room, so they're definitely the closest.
Now, as mentioned before, the twins's nicknames turn into the rhyming pair Will and Gil. They try to avoid this in most conversation as it sounds childish, so they try to go by William and Giles. However, their close friends and relatives still use the rhyming shortenings.
Neither brother has been in any serious relationship before, but they're always there for each other as a wingman, advisor, or cheerer-upper if the other were ever to need it. And that sort of goes for anything in their lives. Ups and downs, good and bad, fights or camaraderie, they'd never leave each other behind. Unless one eats the other's food... Yeah. Then all bets are off.