Darkness
Hand and Eye of Piratecat [Moderator]
Bothered about disposable fiends? Don't be - there are many things that you can do. 
Give them more hit dice - or, as someone already pointed out, class levels.
Get more demon/devil types. In the Manual of the Planes, there are quite a few. In Monsters of Faerun, you get all 5 barbazu types and also a few demons (ghour, yochlol), tiefling types (tanarukk, fey'ri), and a half-fiend type (draegloth).
edit: Or just make some up! Also, you can easily change a fiend's appearance while leaving its stats the same (or mostly the same).
Use creatures (animals, beasts, magical beasts, aberrations, etc.) with the fiendish or half-fiend template.
A half-fiend bulette, for example, should be pretty damn scary. Especially if it has 27 HD (and therefore is of Gargantuan size) and/or a few levels in Blackguard or Frenzied Berserker (the latter requires at least a few Barbarian levels first, of course).
Or how about a tribe of half-fiend ogres - hey, if your world has lots of fiends, it's bound to happen some day, you know! Some of them should also have a few class levels, of course.
And medium- to high-level tiefling or half-fiend characters are also neat, of course. Or maybe a nice tiefling lich or vampire, perhaps?
BTW, do you have Dragon #289? If so, pack the kaiju template on one or two of these critters and watch your players quiver!
Equip your demons with magic items - especially items that only creatures of evil alignment can use (at least without penalties). Example: The Demonsblood Sword in "The Harrowing" (Dungeon Magazine #84). It causes demon fever (as described in the DMG) in everyone it hits (Fortitude save, DC 18 to avoid). It also causes this disease in its wielder unless he is a demon (if he's not a demon, he has to make the aforementioned Fortitude save every 10 rounds while holding it).
Or just use a plain old unholy axe, an intelligent weapon of evil alignment, a demon armor, or something like that - you get the idea.
If encountered in their living area, fiends probably have traps, guard creatures (or guards) and a lot of really nasty and/or blasphemous furniture. Also don't forget torturing equipment, of course.
Have fun!

Give them more hit dice - or, as someone already pointed out, class levels.
Get more demon/devil types. In the Manual of the Planes, there are quite a few. In Monsters of Faerun, you get all 5 barbazu types and also a few demons (ghour, yochlol), tiefling types (tanarukk, fey'ri), and a half-fiend type (draegloth).
edit: Or just make some up! Also, you can easily change a fiend's appearance while leaving its stats the same (or mostly the same).
Use creatures (animals, beasts, magical beasts, aberrations, etc.) with the fiendish or half-fiend template.
A half-fiend bulette, for example, should be pretty damn scary. Especially if it has 27 HD (and therefore is of Gargantuan size) and/or a few levels in Blackguard or Frenzied Berserker (the latter requires at least a few Barbarian levels first, of course).
Or how about a tribe of half-fiend ogres - hey, if your world has lots of fiends, it's bound to happen some day, you know! Some of them should also have a few class levels, of course.
And medium- to high-level tiefling or half-fiend characters are also neat, of course. Or maybe a nice tiefling lich or vampire, perhaps?

BTW, do you have Dragon #289? If so, pack the kaiju template on one or two of these critters and watch your players quiver!

Equip your demons with magic items - especially items that only creatures of evil alignment can use (at least without penalties). Example: The Demonsblood Sword in "The Harrowing" (Dungeon Magazine #84). It causes demon fever (as described in the DMG) in everyone it hits (Fortitude save, DC 18 to avoid). It also causes this disease in its wielder unless he is a demon (if he's not a demon, he has to make the aforementioned Fortitude save every 10 rounds while holding it).
Or just use a plain old unholy axe, an intelligent weapon of evil alignment, a demon armor, or something like that - you get the idea.

If encountered in their living area, fiends probably have traps, guard creatures (or guards) and a lot of really nasty and/or blasphemous furniture. Also don't forget torturing equipment, of course.
Have fun!

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