I think it will sound kinda silly but I like this idea.
Have a Melee weapon that you can equip on your bot instead of the gun (or both) it could be a robotic stick or somethin, maybe a spear? and it could do a bit more dmg than regular hit and it would have a special ability, maybe stun or push?
Idk, it's just my opinion, I like it..
What about you?