Some neat demon Glyphs to add more flavor to the class would be:
Glyph of Fel: Replaces your Voidwalker with a Felwalker. Same skeleton, but fel green with flame effects. (Basic Inscription recipe)
Glyph of Fire: Replaces your Voidwalker with a a Firewalker. Recolor to red (similar to fel orcs).
Glyph of Gnome: Change your imp into a gnome. (Rare drop from any gnome player)
Glyph of Murloc: Replace your imp with a fel murloc found on the Broken Shore). (Rare drop from Fel Murlocs in said broken Shore)
Glyph of Dark Felstalker: Replace your Felhunter with a Dark Felstalker (found in Tanaan Jungle). (Basic Recipe)
Glyph of Harpy: Replace your Succubus with a harpy. (Uncommon drop from harpys in Val’sharah)
Glyph of Fire Infernal: Replace your Infernal with a regular fiery one.
Glyph of the Fel Reaver: Replace your Infernal with a Fel Reaver. (Rare drop from Fel Reaver in HFP)
Glyph of Infernal Core: Replace your Infernal with a Living Infernal Core (Nighthold Guldan Mount). (Drops from Gul’Dan, any difficulty but LFR)
I’ve never played warlock, so I’m not sure if some of these are already implemented into the game, but I think more diversity in Warlock pets would be really neat.
EDIT: Added some possible drop locations.
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any glyphs added are great, im totally ok-
I am a strong supporter of this idea now
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This post was inspired by your thread, actually! 
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i knew my inane posts would serve a purpose some day
im gonna go tell my mom i told her so
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Fluffy trying to lure a harpie
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I would sacrifice everything to have playable Murloc Demon Hunters.
/raises eyebrow
I am… intrigued. Do go on.
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You know the big spooky thing in Hellfire peninsula? You don’t even have to do damage to PvP enemies. Just the sheer PTSD of seeing it will make them surrender 
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I like this.
Kinda stepping on shaman toes with this but eh. I’ll take it.
… No.
… Yes.
Why not.
Lost me again but I think this will make someone happy.
Yes please!
I know a mechagnome who would love this.
Oh yes please, thank you.
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For the fire Walker I couldnt find a good way to describe it. There wouldnt be any fire effects but it would just be, well, red? Fire probably isnt the fight word, but I can’t use Fel Glyph twice lol
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The game isn’t ready for such an op ability sadly 
Oh I got you!
I know the ones you mean.
Yes that would be lovely.
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I’d pay 10k gold for the Fel Walker glyph. Three of them, actually. One for each spec.
/Slaps sack of gold on table
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Oh how I do love you Kul’tirans. So bombastic.
Apocalypsis Walker?.. The Abilities of Argus when possessed by Sargeras use the word Apocalypsis…
Blood walker might work because maybe, fel blood? And red?
Blood is Void/Shadow-tortured Life Magic not Fel… It is commonly seen with G’huun, Bleeding Hollow, Mogu, Blood Elves(stealing from Mogu), San’layn and the Venthyr(along with the equally Red Sin AKA Shadow-tortured Death Magic)
Red Fel Magic appeared in the Sword of Sargeras, tainting the flames of Kil’jaeden and in Sargeras-possessed Argus. In Argus’s case the Death Fog is renamed to Apocalypsis Zone.
Apocalypsis-walker is best for Red Fel(though it would need a custom Skin/Model). Red Blood and Red Sin can be separate Glyphs since both their Elementals have unique Models.
Sin: https://shadowlands.wowhead.com/npc=160866/gluttonous#modelviewer
Blood:
So a gnome mage, right? I’ll take a millhouse manastorm on call.
Would be cool if there was glyphs to change what your wild imps looked like for demo warlocks.