Last part to the list. Make sure you look at Parts 1 and 2 so you know what I'm talking about.

Into The Cave
“Game Master” Tsukihito Amanuma-E-
Mitari-E+
Genkai-C+
Yanagisawa-E
Kaito-E

Elder Toguro-B

Minoru Sensui-B+
[Reshuu Shiendan]-B+

Yusuke-B+

Kazuya Sensui-B+
[Kikou Gun]-B+

Shinobu Sensui-A-
[Seikou-Ki, 10%]-S-

Breaking Into the Makai

...

Cableguy15

Continued from Part 1... If you aren't sure what this is, check out part 1 for the explaination.

Shadow Channelers
Kurama-C

Gama-C-
[War Paint]-C

Toya-C*

Bakuken-D+

Yusuke-C+*
[Rei Gun]-B-
[2nd Rei Gun]-B-
[3rd Rei Gun]-B-
[Aura Blast]-B-

Jin-C+
[Terror Tornado]-B-

Risho-C+
[Carnage Earth Battle Armor]-C+

Kuwabara-E+
[After Seeing Yukina]-B-...

Cableguy15

Here's what I think the Demon Classes are for everyone in the series. Note that I went only by the manga (15 volumes of Viz and the rest Fan Subbed) and added the fan-made "S-" and "S+" to the list. I'm aware they don't exist, but this is to give a better idea of what I think their power is. If you want to see a more descriptive version that's more in-depth, check out "Yu Yu Hakusho Demon Classes (With Numbers).

Spirit Detective Saga
Goodbye, Material...

Cableguy15