Ninja's should not have heavy armor. Unless we are samurais, in which case, you messed up with the lack of sword.
That's what's missing with us engineers !! A DREADFULL SAMURAI SWORD !! And the melee stance, where Electrocute becomes "Electrosword", and bolt caster "Skuriken Slap". Would be fun meh
And I just got up with some crazy ideas for some of our spells, I know it's crazy, but I don't care, because it involves a Jetpack.
Energy Auger : The telegraph and mechanics of the spells would be the same, but instead of shooting it straight forward us, we'd spawn a jetpack, overload it, and choose in which direction it'd shoot US, leaving the well known flame trail from the spell behind us, as we're jetpacking.
Tresher : I honestly can't find any use for this spell, as I find the cost of it versus the benefits not worth at all using this spell. What if it'd spawn a land mine, exploding for the same damages once something walks on it? Honestly, Stalkers have mines, (By the way i'm sure these mines are crafted by some engineers) why haven't we any?
Mortar Strike : I have no constructive idea, honestly I'd like to use it in my everyday DPS cycle, because mortar and explosions are fun, but can't get a reliable dps with it (Maybe because I'm too dumb, but I'd never admit it. Or did I?)
So : Make it channeling, like some Marauders in Skullcrano, and with tiering, everytime we hit our target, some of the volatily cost is refunded. But I'd be another electrocute spell like and not bring some variety in our gameplay.
Or : Make us put a mortar in our mouth, SHOUT OUT all our rage, and JUMP on the enemy with our jetpack while screaming "MORTAAAAAAAAAAAAAAAAAAAAAAAAAAR" and then EXPLODE !!!
To make it quick : Jetpacks, Ninja Sword, and Mines.
Hope it'll give some ideas, or at least make someone laugh. I laughed while writting it, so I guess I achieved my goal.
Gannbate, I'm sure Engineer will become the top swag class everyone wants to play soon ;D