Death Gods

Death
The first god of death, and probably the strongest being of his time.

His color is presumably red.

Grim (Reaper)
The second; Grim was Death's right hand man, and got Death's powers to help out with the job.

His color is possibly yellow or gold?

Yin
We don't know anything about Yin about him other than him being the third.

His color is unknown.

"Death" (Real name unknown)
The fourth-he's the man that Dell kills at the beginning of the story. It's unknown how he managed to become the god of death, but apparently he wasn't very good at it. He also apparently wasn't the god for very long before Dell killed him at the Asylum.

His color is purple.

Dell Jesse
Dell is the fifth, and potentially the strongest of the previous two, maybe even three, gods. Since he was a Nephilim anyway-he seems to already have a good hang on magic. His attitude also seems very fitting for a omen of death.

His death-god weapon is a dagger/blade, and he has the unique power of manipulating time.

Dell's color was originally navy blue.

Leor
Leor was made the sixth god of death after Dell died, and is the second youngest, being a child/young teen. He wasn't a god for too long though. We don't know too much about him, other than he was blind. He only showed up in a small spin-off one shot.

Leor's color is unknown.

Dell Jr. Jesse
Like his name indicated, he's Dell's son. Becoming the god by an unknown means (probably Leor dying.) We don't learn anything about him, and we know nothing of his powers. He was the youngest, being a child, and was the god for the shortest amount of time.

Dell Jr, like his dad again, has his color blue. Though his is light blue.

Torozan Izinami?
Toro, the eighth, became the god by presumably random chance. Initially it was thought that Dell planned on that, but it's still a mystery. He's the first god to stop becoming the death god, but not dying. At least-that we know of.

Toro's color is never revealed, but heavily implied to be red.

Tora Izinami/Rodgers?
Tora is the latest death god, being the ninth, and she's the first female death god. She seems to have become the god sometime early in her life (potentially from her being a soul-split, which could explain why Toro didn't die.)

Her weapon is currently unknown, but she has manipulation magic. It takes the form of puppet-like strings that she can move objects and such with, sometimes you can see the strings, while other moments you cannot. It's hard to place anything because she hasn't known her magic for long at all.

Her magic is lime green.