Yesterday

Yesterday, also known as Dani, is the leader of Heaven. He is a strange, angelic being who has a giant eyeball for a face.

Season 2
At an unknown point in time, Donut returns to Heaven and spots Yesterday, being reassured by Yesterday's promise that they would see each other again.

Season 3
After Donut is killed by Jeff, he goes to Heaven and meets Brigade. The two talk among each other, until suddenly Yesterday appears, greeting Donut. Donut wonders who he is exactly, and Brigade introduces him as Yesterday, the leader of Heaven. Yesterday reassures Donut that he may be called Dani. Yesterday then signals a vision to Donut, which shows a long countdown. Yesterday states that it's the countdown towards Donut's actual death, and that he died prematurely. Donut is then sent back to life, and Brigade asks why he would die before he was supposed to. Yesterday says that the Big P must be active because of it.

One night while travelling, Donut falls to asleep and has a dream that Yesterday arrives in. He states to Donut that he has a reassuring message to give. He openly says that he realizes that Donut is still unsure about Heaven and his experience with death, which Donut acknowledges. Yesterday says that when Donut arrives in Heaven once again, according to his actual schedule of death, he will still be ruling over the place. Donut understands and then seems to let out a slight "ugh" which catches Yesterday's attention. Donut says to forget about it, and then wakes up.