While Support is definitely not as easy to create as the other roles, I think it is distinct and has a place in the game. I think there is a craving for more supports by the playerbase, and the playstyle of focusing on assisting your team outside of healing or peeling. I feel like there is something of a defeatist attitude here, so I wanted to bring forth some ideas for examples of what a Support could look like!
Unng Ak is a furbolg that who uses etched totems to empower his druidism. Over the course of the game, Unng Ak can select additional Wild Gods to draw power from through his totems, which have a variety of effects, some negative for enemies and some positive for allies. Unng Ak specializes in zoning damage and buffs.
Cenarius is a patient and planning Support who must look far into the future in order to maximize his abilities. He offers unique buffs to his allies and can create moments when his team can easily push forth and claim structures through the use of a special summon, as well as overgrowing structures.
Izsha is a special defense based support, attaching to forts to heal them while sending out her mobile buildings outwards to hold down areas, or defend her attached fort. Izsha utilizes drones in her playstyle primarily, and brings the defensive zerg structures into the game in a unique, highly complex manner. She brings some of the RTS micro gameplay into HotS.
Mida is a crafty and selfish support, who assists her allies throughout the match, but always for selfish reasons. Her ability to make her allies into Goons and then benefit from all of their effects cements this attribute, and she primarily helps her team by allowing her allies to output bigger numbers. Mida is unique in that she has abilities that enable her allies without making any big plays herself.
Symmetra is a defensive control-oriented character that focuses on keeping enemies down as she deals damage over time to them. Her main focus is to reduce an enemy’s output while her shields protect her allied heroes.
Belial is a mindgames-based support that can be a core of a Lord of Hell themed team. He has the maximum number of options to keep his enemies guessing, while still being useful outside of pure smoke and mirrors. He is focused more on suppressing enemies and enabling his team all through illusions.
Magatha is a buff-centric support that can provide her team with a solid boost to their damage and survivability. When needed, she can call upon an Earth Elemental to provide her with some extra damage, and she can use her buffs on her elemental to greatly augment her damage and disruption.
Rhonin is a high utility support who utilizes his mana and careful management of his abilities and health to shut down the enemy team and protect his team. He has no healing capabilities (hence why he is a support), but contributes moderate damage and disruption.
Vorazun specializes in pairing with an ally and making them into a lethal stealth assassin. With her Shadow Assault and her Veil of Darkness, Vorazun is incredibly hard to catch, and can become a pest for the enemy team with her Stasis Ward and the damage dealt by Shadow Assault.
Nozdormu is a very aggressive support, who lacks real healing but offers a variety of damage and utility options for his team. His ability to manipulate time offers new tools for the player, such as hastening debuffs placed by enemies as well as stalling enemies from healing their allies or buffing them.