Okay so if we’re talking Blizzrd heroes I would have to say Mercy, and I think the big thing for her would be swapping between pistol stance (which would feature abilities that reduce outgoing damage baseline) and her stance, she would be suscpetible to blinds but be by far the most mobile support
However if you want to hear about an original,
I have a base concept for an Iresian named Zeraq, I based him off of two of my favourite villains from Fiction, Brackus from Di-gata Defenders and Lex Luthor,
He would be a healer who uses “Cyber Blood 2.0” where Qhira’s bleed daamge is Cyber Blood 1.0 ,
A lot of the design would be based on shock and awe tactics, where he’s mage like in the sense that his abilities have a lot of flare even if somewhat more simple, and applies a dot that heals a teammate of his choosing for 200% of the daamge dealt.
I need to redo his concept without the restrictions of a CDC but the only thing I am sure will stay is the Ultiamte, a new take on a Nano boost, where the target deals 40% more damage, but that 40% is applied as a damage over time, and then that damage over itme heals the lowest health ally within range for 100 % the damage dealt.
Go nuts my friend