Maybe...

It would be nice if RIOT came out with a Demacian (or a freelance) Witch doctor named Tibbadeux (pronounced Tib-Ah-Dough) The Whispering Witch Doctor who could be a support, jungle or APC. If APC then they have a ranged basic attack and if AD then they have a melee basic attack. The reason why the many roles is because the Witch doctor's passive will be "Cursed Doll" (two part passive). The start of the game you have to decide AP or Physical doll and all other abilities will coincide with said doll. Picking the AP doll allows your abilities to scale with AP and picking the Physical doll will allow you to scale with AD. The AP doll's passive will allow your basic attacks to bounce to up to 3 targets hitting them only once per target (does not scale with ad items only runes and masteries. Stacks with armor.). The Physical doll's passive will be: Basic attacks apply a curse that lasts for 10 seconds. Within those 10 seconds healing is reduced by 50%. You must wait for the duration of the cooldown of this passive before the unit can be cursed again. Cooldown of this passive is 60 seconds. Now i am not going to put stats and other numbers because that is RIOT's job. I just simply have the idea of an OP champion.

THIS CHAMPION HAS A HELL OF A LOT OF CC SO HIS BASE DAMAGE, ARMOR AND MAGIC RESIST WILL SUFFER BECAUSE OF IT

Q: Voodoo Magic (AP) Fires a cloud of magic powder made from the bones of his victims that blinds anybody who walks in it and damages them. Cursed Possession (AD) Throws his voodoo mask at target location dealing damage and fearing all who are in the radius. Same cooldown at all levels for AD.

W: Summoning Circle (AP and AD) Places a summoning circle at target location (small radius) that buffs all allies who walk through it and slows/damages enemies who walk through it. If an enemy is in the circle by the time it disappears then they are rooted in place. If a minion dies within the radius of the circle then it is resurrected with only extra health. Can only have a maximum of 3 minions resurrected at a time (does not apply to jungle monsters). Can only control one minion at the same time. If used on your own minions then your towers will not attack them but the enemy towers will. If used on enemy minions then their towers will not attack them but your towers will. The three minions will follow you as long as you stay in lane. Although they stay with you while you are in lane or until they die, they still need their master's magic to remain alive. Straying too far away from them after you controlled them to go to target location causes them to go back to the underworld.

E: (AP) Sacrifice a possessed minion to remove a CC effect from target ally (can only be used on target ally that has a negative CC effect applied) or use the sacrificed minion to heal and grant a move speed boost to an ally (the heal does not remove the CC effect). Ally only gets move speed boost when not under CC impaired effects. If a CC effect is removed the cooldown of this ability is 20 seconds. If the heal was used then the cooldown of this ability is 7 seconds. (AD) Throws a possessed minion with such force to target location that it explodes on contact dealing AOE damage to surrounding units (The minion is sacrificed when explodes). When targeting a champion with the minions they receive a speed buff while in the air. Applies on hit effects.

R: Voices of the Unknown: (AP and AD) Tibbadeux opens his voodoo bag and unleashes voices of witch doctors of the pass. This is a skill shot and It can bounce to up to 5 targets and hit each target multiple times. Each unit hit is silenced for 3.5 seconds. It will hit all units who are not silenced after the first unit becomes silenced. This ultimate does damage based on the amount of targets it has to bounce between. The silence can only be applied once but the damage can be applied multiple times but gets weaker as it travels from target to target. If 5 targets are not around then each target that gets hit multiple times will be slowed for each time it has been hit. If the witch doctor is hit by Voices of the Unknown (only applies on first hit) he gets healed based upon the damage Voices of the Unknown would have done.

Any of the duration's i said are subject to change if RIOT decides to read this and accept the idea.