Thats something I wanted to mention before, but typing on my phone sucks. A lot of the good red decks are super linear - they run the same gameplan every single time and often do so in a very straightforward way while they're at it. A lot of my games with Krenko, Mob Boss devolved into "mountain, go" while I waited for a chance to cast Krenko again. Gross. This might be your style, but EDH games are a lot longer than normal magic games, so sitting there waiting for that mountain or hordeling outburst while everyone else is slinging spells might get really old really fast.
Krenko & Purphoros are the worst offenders here, though Zada is pretty straightforward too I feel there is more decision making in that deck. Daretti and Kurkesh are always "trying to do artifact things" but not necessarily in a linear fashion. Neheb isn't linear at all, though he isn't as straightforwardly powerful as the others. I use him to toss out random crap I don't need at that point in the game rather than to dig for the same pieces.
A few I missed; Feldon of the Third path as mentioned above is sick, and never seen anyone actually play it. This is one of the best red EDH cards hands down so would make a solid general. If/when I change Neheb it will likely be to this. Another is Kiki-Jiki, Mirror Breaker. It's sort of half infinite combo and half "copy a Wurmcoil Engine, sacrifice the copy for tokens". But thats a lot of the decks here. Our best EDH effects in the colours imo are graveyard interaction (mostly just feldon, but some artifact ones), temporary token making (feldon, kiki-jiki, flameshadow conjuring etc), wheels, artifact manipulation (daretti, kurkesh, goblin welder) and for some decks various "each player" based burn effects.
Some less popular commander options;
-
Akroma, Angel of Fury: I've seen this run at a very high power level. That deck ran in cEDH or borderline cEDH pods. God knows how he did it though.
-
Neheb, the Eternal: You can farm his ability using earthquake type effects, very explosive.
-
Najeela, the Blade-Blossom: 5c mono-red, any deck that can make 1/1s can profit off of skullclamp and similar effects.
-
Heartless Hidetsugu: Has insta-win combos using life total manipulation and a damage doubler, a really cool deck for ensuring games are short and bloody. Would not recommend as a sole deck though as he distorts the normal EDH game style and will get on peoples nerves if every game was a Hidetsugu game.
-
Godo, Bandit Warlord: One of the few mono-red cEDH options due to being able to tutor Helm of the Host and go infinite or semi-infinite. He's not very good outside of that as red is not set up to really benefit off of equipment.
-
Purphoros, Bronze-Blooded: Haste in the command zone and sneak-attack-esk ability means this guy can potentially be very powerful, have not seen it in action though. I'm more after card advantage than explosiveness in that zone personally.
-
Squee, Goblin Nabob: Mainly used to discard to red's looting effects as a way to generate card advantage.
-
Zo-Zu the Punisher: Another group slug option like Hidetsugu. Pair with land destruction, blood moon and other troll red stuff and piss off the table.
-
Norin the Wary: ETB effects, such as purphoros or
Impact Tremors, that go off again and again with him out.
-
Zirilan of the Claw: Someone on here or on mtgsalvation has a great primer for this guy. Tutor out dragons, sacrifice them for value to avoid the exile trigger, repeat.
If you need to cut through the tl:dr in this thread, just find a Daretti precon from like 2015 or whatever and start from that. This would be the easiest option and is one of the most powerful.