So, leaving aside any and all issues of BLU and assuming that SE decide to really flesh out the job... (Also allow it to get spells from duties more easily *Cough*DF for BLUE*Cough*)
What monster abilities do you think that BLU's should be able to get in the future? What do you think they're missing?
So far, my list of abilities that I recall from monsters that I think could be cool or useful include:
Fireball - Puk's
Foul Breath - Raptors
Sneeze - Goobues
Dark Fire - Succubi
Mysterious Light - Pot enemies (Such as those found in PotD and Lost City of Amdapor (Hard))
Canopy - Treants
Lion's Breath - Certain Dragon bosses, such as Chudo-Yudo in Stone Vigil
Granite Rain - Non-Aspected Dragons
Rime Wreath - Ice Aspected Dragons
Dread Gaze - Ahriman (Also Basilisks and some serpents I believe?)
Screwdriver - Pugils
Bubble Spray - Megalocrab
Sour Sough - Blue Landtraps
Swift Sough - Red Landtraps
Typhoon - Koschei (Stone Vigil)
Hooked Burrs - Miser's Mistress (Aurum Vale)
Rotting Lung - Manxome Molaa Ja Ja (Wanderer's Palace (Hard))
Rotting Gas - Manxome Molaa Ja Ja (Wanderer's Palace (Hard))
Irritating Tendrils - Jellyfish
Unfinal Sting - Tarantula Hawk (Dravania Hinterlands)
Neck Rip - Wolves
Whipcrack - Certain Dragons
Bombination - Certain Dragons
Microblaster - Coeurls
Charged Whisker - Coeurls
Stagnant Spray - Efts
Burning Cyclone - Certain Biasts
Dragon Breath - Aiatar (Brayflox Longstop)
Just off the top of my head at least. These could be interesting additions to the BLU's repertoire (As well as providing more variety during leveling outside of Water Cannon spam > 1000 Needles spam into > *Cough*Solo class*Cough* Ram's Breath/Glower)