Lock was the first toon I ever mained and will always have a special place in my heart. What I would like to see is more done with the imps. From the rare quest npc to some voice that finally came in our pets.
What would be awesome and not just a number on a screen?....
Fire bomb- (Goku's sb cast animation) your imp/imps charge a devastating firey orb does x damage + an extra 20% for every mob hit within 8yards of primary target max 100% extra damage.
Demo- the wake of devastation from the blast leave a firey portal on the ground which the demon king imp himself rises from. And he just wants a hug rooting and Exploding on a target in his near vicinity.
Destro- in a last ditch attempt to please it's master the imp expells the last of it's energy to barrage the targets with hellfire from above. Next cast off summon imp instant for 5 seconds.
Rain of fire mix type with that one talent last X-Pac that was the barrage or whatever.