Sprout

One morning, Cosmo was strolling calmly through the hallways, looking out the large windows that occasionally opened up between rooms, walls, and so on. Hearing the sound of some commotion, he immediately turned his attention to Sprout's room. From there, he could hear rustling sounds and the scraping of transparent film.
Cosmo peeked into Sprout's room, opening the door slightly, just to see what his friend was doing there at such an early hour.
Peeking through the crack in the door, Cosmo noticed Sprout standing there shirtless. A large scar, seemingly very deep, was visible on his chest and left side. Sprout was bandaging it, humming to himself. He hadn't even noticed Cosmo seeing him like this, so, at least for now, he wasn't thinking or worrying about anything.

Sprout is overprotective, understanding, kind, and compassionate. He's always ready to help and cares for everyone—even those he dislikes.
Cosmo is overly generous, very caring, and understanding, like Sprout. They are both empathetic, but Cosmo is 100 times more compassionate than his friend. His generosity can lead to self-sacrifice, and he is also willing to sacrifice his own life for another's if necessary. No matter the person's relationship to him or Cosmo's relationship to the victim, he will always come to the rescue if needed.