Your purpose to your team is to roam to each lane and haunt the enemy laner with debuffs. You haunt them, and guide their way to a demise brought on by allies and enemies of the mortal realm.
takes a bow
I think there are better ways to execute the haunting roaming phantom theme than to remove any interaction for the enemy and the ability to actually farm your own jungle.
I posted a champion concept similar to this some years back in which the character could attach to other champions (similar to Yuumi), friend and foe, "possessing" them. Should this champion have died, she was able to roam freely, ignoring terrain, while respawning. She couldn't be seen or interacted with during this period, but she provided vision to allies.
That is Shaco, except he is on your team
