Wanted to start a thread to collect suggestions.
The ones I've found so far that I think fit the theme are:
- The two purple Manasabers
- Shadowcrazed Marsuul
- Shadowcrazed Chitinbuk
- Arcane Purple Draenor Boar (glowing purple eyes, weird spikes, fits really well)
- Shadowy Draenor Wolf
- Teal-black Raven
- Black Raven in BFA?
- Black Nightsaber
- Dark Purple Spiked Crab w/ Purple Markings (e.g. from BFD)
- Purple Nether Ray
- Purple Mana Ray
- Blue Spiked Raptor
- Violet Mana Wyrm
- Purple Arcane Wyrm
- Purple Draenor Sporebat
- Purple Warden Owl
- Black Diematrodon (has a purple fin)
- Black Scarab w/ Magenta Spots (BFA)
- Indigo Crab (BFA)
- Black Draenor Ravager
- Black Dreamrunner /w Purple Glow (Lucid Nightmare, BFA possibly?)
- Dark Grey Crawg (BFA, creepy abberation looking thing)
- Black or Blue Krolusks (BFA)
- Purple Stone Quilen / Purple Armored Stone Quilen
- Blue Wasp / Purple Wasp
- Blue Boss Wasp / Purple Boss Wasp
- Magenta Firefly
- Purple Firefly
- Arcane Purple Hippogryph