So the idea here is that, while Kruber is no Engineer, he does have experience with explosives. It’s even mentioned in dialogue concerning bomb whiffs; Kruber will talk about the proper throwing technique and Saltzpyre will comment that he (Kruber) should know.
While Grenadiers obviously bring to mind guys with, well, grenades, historically they were also big strong men; the shock troopers of their day. So the career would have a focus on explosives, but not be bad in melee. I imagine it as having 125 health, not being as bruisery as Merc or Foot Knight.
Ordinance Training - Grenadier doesn’t do friendly fire damage with explosives. This includes bombs, barrels, oil flasks, and of course, the Grenade Launcher.
Protective Gear - Grenadier takes reduced damage from AoE attacks, and also has an aura that reduces the AoE damage that allies take. Unlike the relatively small general damage resistance from Foot Knight, this could be higher, like 30%, just limited to AoE.
Explosive Rounds - On critical ranged attacks, Kruber’s shots explode, creating a small burst of damage and stagger around the point of impact(comparable to first charged attack from Fire Flail). On Grenade Launcher crits this can simply add more damage.
This could be absolutely devastating on Blunderbuss, but the career could just have no crit improvement mods natively, meaning that (besides WHC’s ult) he can only stack 15% crit at most.
Bomb Pouch - Grenadier gets two bomb slots.
Career-Specific Weapon: Grenade Launcher. Due to his Ordinance Training passive, this solves the issue of friendly fire with the weapon. I imagine each shot as being fairly powerful, but not as powerful as a bomb. They have no headshot multiplier, but can crit. A long reload, at least on par with handgun. Would be great to fire at bosses, massed Elites, or hyper-dense hordes.
If you wanted a career-specific melee weapon, you could use a linstock, though I feel like it’d be very similar to his Tuskgor Spear.
As for career ability, I’m really torn here. My heart is screaming: HELLSTORM ROCKET BARRAGE, that would work similarly to the Arrow Storm in For Honor.
It’s hard to make sense of that, though. Who are firing these Hellstorm Rockets? How would they work inside or underground?
Yet it would be awesome to see Kruber point and yell out something like “Rain down hell!” and see a buncha enemies consumed in a barrage of rockets.
A more . . . logic-friendly ult would probably be something like throwing out mines that incoming enemies can set off, or throwing out some small flash bombs or something.
As for how he looks; he could have the coat of an engineer, would kind of make sense as protection:
Most historical artillerymen of a similar era wouldn’t be that distinctive from other soldiers, so the engineer’s coat might be well-fitting.