Branch's Links
Even if the other doesn't feel the same way, Branch views him as friend, and has been ever since they first met since both their toys come from the same series, though he believes he could use some "toughening up"; he's unaware of how Droplet feels about him. Even if Droplet isn't in immediate danger, Branch is willing to lend him his aid, even if it's for something silly like helping him pick out which bow to wear for the day.
Droplet's.. not quite acquaintance, but the two seem to always run into one another. Knowing that their toys are from the same series is comforting in a way, but at the same time, he's intimidated by Branch's loud personality. If the green cherub was just a teeeeeny tiny bit calmer....