he should be turned into a passive support.
people always joke how hes a living ward. so imo they should actually make him good at it. insetad of having his shrooms explode and deal damage, let them be a vision tool.
i mean it fits his theme. hes supposed to be a scout. maybe if allies run over them they could be consumed for a movement speed buff or a shield instead, and if enemies step on them they grant true sight for a couple of seconds. he could get a new passive that works like rengars ult and lets him see the outlines of enemies within a certain distance even in the fog of war.
or maybe his shrooms could work like the scuttles ward and provide vision and a speed buff in a small area. i mean he is called "the swift scout" and not "the anoying assassin".
his q is pretty useful for a bot lane support so they could keep that. maybe even turn it into a skillshot that blinds in a larger aoe upon impact. his e could be turned into an active and replaced with his current passive so he can sneak around enemies in the jungle.
he would actually get a theme as a scout who provides vision for his team, and tracks down enemies instead of just being an anoying troll.
plus, we dont have a support thats themed around vision yet. so this would give him a pretty unique kit.