I was thinking of how to counter mandrake’s gold ability, and several other characters that can turn invisible. After consulting with another player, we felt a good idea would be a hero that has either:
Silver Ability - Like Orro fires a blast to hit all enemies doing mild damage, but blocking invisibility for 8-12 seconds. (8-12 seconds because it is a charged ability)
Gold Ability - When the hero hits an enemy with its primary weapon, they cannot go/become invisible for 3 seconds.
Gold Ability (V2) - same as V1, but with a percentage chance to block invisibility instead of guarantee, but up the timer to about 6 seconds.
As far as character design, I would make him Mech or Chem, and look like a hunter. either a sniper or shotgun user with a slower rate of fire, but mild damage. Maybe give him/her a look like Vash (Trigun).