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Khorne: Rage, Anger, War, BloodShed, etc.
Nurgle: Entropy, Dispair, Corruption, etc.
Tzeentch: Change, Evolution, Mutation, etc.
Slaanesh: Decadence, Selfishness, Pleasure, etc.
While there have been other gods and demons in various lores and stories, these four are the big boys. As you pointed out, the other gods are simply not developed enough to contend with those four.
It's not uncommon for people to create their own lesser god for a particular theme, so you can certainly feel free to go nuts when it comes to making up your own fluff; it's just important to keep in mind what currently exists.
You can't reason someone out of a position they didn't reason themselves into.
Not of fear... what you want, is a god of Terror. And if there was one, Night Lords would jump right in to volunteer as his Cult Marines.
Oh yeah... and four Chaos Gods? I say thee nay!
There is a fifth God of Chaos, even if almost everyone has forgotten by now.
Malal, Zuvassin the meddler, Necoho the doubter.
Zuvassion strives to undo things, Necoho is like an anti-god - he grows in power the less followers he has, he is the godless god - if you don't believe in gods and things then you will find yourself worshipping Necoho - a paradox.
Scope for plenty of fluff, even if it's harder to understand than the works of shakespeare translated into hungarian.
I defy anybody to come with viable Necoho worshipping chaos army that makes sense.
Can't be done.
I can't say I've seen it all but I live for the things that keep me hollow.
Who said "we do difficult on the spot; impossible takes some time."?Can't be done.
*Thinks any one of the current Gods could have fear in his/her portfolio. Thinks they all just might.*
Fear could work as an alternate god. As Nikblade said, the other four big gods do cause a lot of fear, especially Slaanesh and Nurgle.
I personally created a minor Chaos god based on greed and wealth.
A couple things to keep in mind though to making your own...
1) Don't make it as strong as the big four. Just because your god isn't one of the Olympians of the Chaos pantheon doesn't mean it can't be awesome. Soemtimes lack of uberness is as compelling, even moreso.
2) Fear is a good one. Make sure that your god's fear is different than the other Chaos gods' fear. Give reasons why this god is unique and why it gathers followers that wouldn't fall udner the regular paths to Chaos.
I am heading off to the Peace Corps. It is bery likely I will not be back. Good luck to all of you endeavors.