Demons & Devils

Hordelings
Hordelings were first featured in Book of Vile Darkness, presented as a Gargantuan swarm that could spawn 1-4 minion brutes once per round when it got hit. This article adds the greater hordeling, which is more in line with what I remember from Planescape--and possibly 3rd Edition, I honestly don't remember--as you choose from any monster role except soldier, and then roll on a bunch of tables to generate the rest of its capabilities; size, speed, sight, special attacks, and even appearance  9which has 17 tables to go through). It is a nice throwback to their roots, and I highly endorse it.

Infernal Prince
It is really too bad that Blackdirge cannot be a full-time member of the staff as I really dig his stuff, and the infernal prince theme is no exception. A character with this theme is directly related to an infernal lord, most often Asmodeus and Mephistopheles, which sends a tutor to them to basically school them in the ways of horribleness.

The starting features give you a power bonus on fire attacks (I am sooo going to make another tiefling pyromancer), in addition to hellfire heart, an encounter kicker that can be used on any attack you make, dealing scaling fire damage and imposing an attack penalty for a turn. 5th-level gives you a bonus to Bluff and Diplomacy, in addition to a reroll against natural humanoids if you roll too low, and at level 10 you recharge hellfire heart when bloodied (and it does more damage if you use it against that target).

• Devil's Due (level 2 daily): When you grant an ally a power bonus or let them burn a surge, you gain a defense bonus for the rest of the encounter and temp hps. On the downside your ally's surge value is halved for the encounter. So, good for leaders?
• Liar's Lure (level 6 encounter): A friendly-fire AoE that lets you make a Bluff check to gain combat advantage against each target for a turn.
• Infernal Inheritor (level 10 daily): A polymorph effect that imposes an automatic attack penalty for a turn, and then gives you darkvision, fire resistance, and a bonus on Fort and Will for the rest of the encounter. Unfortunately, the fire resistance doesn't stack or boost existing resistances.