The seven deadly sins can be split into two groups: the excess sins, and the insatiable sins.

In the first group, the excess sins, it can be found the sins of lust, gluttony, sloth and wrath. These are sins that are satisfied with one simple desire, be it fornication, binge eating/drinking, excesive sleeping and lazyness, or total disconection from the social norms that make coexistence possible. After fulfilling themselves, humans stay in rather good mood, until they desire comes back again. Demons whose speciality are these sins finish their work quickly because their Masters get satisfied very easily.

In the second group we have the insatiable sins, these are pride, envy, and greed. These are sins that can not be used up, they slowly intensify as the time goes by. That's the reason why demons who specify on these sins usually have longer-lasting Masters, it's hard to fulfill them, and it takes much more time to make them grow, since they start up from very low positions. Still it's very worth it for those who choose to work with these kind of humans, because the outcome of their work is very rewarding.