ok so i have an idea. since we cant train our demons like hunters seeing as how we summon them vs taiming them. I would like to see Blizz come up with an epic lock quest chain that takes a good amount of time to complete. Starting with the same order u would recieve your pets during leveling. so imp..... to the felgaurd. once you complete the phase of the chain ending each pet they demonically inherit a cap ability that suits there general or assumed general purpose.
Cap talents. i tried to come up with ideas that wouldnt be to potent in either direction pvp or pve.
Imp- "Rage Fire" - ON USE: Your Imp causes your target to become consumed by flames increasing its critical strike vulnerabilty by ranged and melee attacks by 15% for 15 seconds. this ability does not stack with other crit vulnerabilty abilities and has a 10 minute cool down
Voidwalker- "Nether ritual" ON USE : Voidwalker consumes shadows from the nether granting all party and raid memebers a shield absorbing 50,000 damage over 8 seconds. 10 minute cooldown.
Felhunter - "Eternal Shadows" PASSIVE: Whenever your Felhunter critically hits with an ability it increases your nightfall ability by 2% lasting 6 seconds.
Succubus - "Lashed" PASSIVE: When your Succubus uses it's whip lash ability it also decreases all effected targets' movement speed by 60% for 6 seconds.
Felgaurd - "Fel Power " PASSIVE: When your Felgaurd critically hits with Legion Strike you become consumed with fel energy causing your next fel flame to critically hit for 100% normal damage
i think they seem logical but maybe not. would be nice if all pets in this scenario dealt same damage (except felgaurd) that way if u need to whip out voidwalker for a rough boss ability u could. or if u needed extra burst during bl/tw u can pop the Imps Rage Fire.