Ok here are some dumb support ideas for you all.
An archer with a teleporting arrow he can shoot at one location and travel to. With healing/harmful arrows like Ana’s rifle.
A mine laying support with explosive mines that go off when someone walks on them. Harmless knock back, Aoe healing for allies but damage for foes. Knocks both into the air. Allies can use them like healing jumpads.
Quantum powered healer who can rewind time on allies to undo damage or accelerate time to speed a selected ally up temporarily. Ult resets cool-downs for allies and it does not affect Ults.
A Phoenix inspired healer who uses healing fire to cauterise wounds and burn foes. Leaves a nasty dot affect as his primary way to deal damage. His Ult is a self Rez, that brings him back with a temporary boost to his healing and damage.
A Baby Dva like healer with a drone that attacked anyone that gets near her, extremely short range permanent mini turret, low damage. She heals using an emitter device. Her Ult summons a mech that lasts until it’s destroyed. With low health seeking missiles.
A support that marks an enemy and any damage done to the enemy emits an Aoe heal to your allies in a pulse radiating from the enemy.
An alchemist. Throws potions with various effects from an elixir gun. Cycle through the potions using right click and fire using left click. Personal abilities involved drinking potions to temporarily increase abilities.
A duel wielding pistol support who heals by shooting his allies in the face for crit heals. A mid range hitscan healer. I just really want to shoot my team in their faces sometimes. To heal them. Of course.
A support with a short blink like teleport, that uses a wide beam, short range scanner weapon to heal allies and hurt foes. Think a of a less mobile tracer with a weak Winston style weapon. They leave Aoe fields on the ground that heal allies or hurt foes, that look like disco floors.
An psychic support that creates illusion to heal and harm. They can create harmful and scary illusions that hunt or track foes, low damage jump scares. Or create calming illusions that emit pulses of healing.