Florian
Florian is an angel with an unstable form. He is weaker than most angels, and had to spend a great deal of his childhood in medical treatment. His golden eyes are a clear sign of this, and so he tries not to draw attention to them.
Most importantly to him, Florian is the knight of Heaven's rose garden. He trained to be a knight for years, having been personally recommended and trained by a higher ranking knight. Despite the amount of effort he put in, most of the captains didn't accept that he could truly be a knight, due to his condition. So, he was assigned to the rose garden, the safest place in all of Heaven, a place without a single guard, until him. It was supposed to be something of an insult, being assigned to it, but it went over his head, and he takes his duty completely seriously.
Florian is an angel who is stoic, duty-focused, and doesn't understand social interaction. He tries to follow every single rule to the letter, and do everything he is told. He can come across as blunt, and even rude, which hasn't earned him any friends.
But, for reasons that he can't understand, an angel who's always at the rose garden has made a point of trying to befriend him, despite his rough edges. And that angel is Aster.
He has no idea how to handle Aster, how to handle anyone actually making an effort to befriend him. He allows the friendship to grow, though he might deny that it's a "friendship".
Over time, as he learns more about them, he begins to develop feelings for them, which are against the rules. After much panicking, shame, and self-blame, he finally confesses to them. Much to his surprise, they return these feelings, and the two begin a relationship in secret.