1st - I Would love to see the druid from diablo 2 OR DIABLO 4 make an appearance in the nexus. He has many different abilities from his skill tree that can come into play and I think they he would make a great addition to any Meta/Draft.
2nd - I would REEEAALLLYY love to see the Diablo 2 Assassin make an appearance in the nexus with Fade/Claw Attacks/Blade Shield/MindBlast(with a cooldown)
and her ultimate allowing her to lay down a group of lightning sentry traps to blast her targets OR a DragonFlight kick with a large chunk of damage and stun for teamfight initiation. Her TRAIT can be Envenomed claws with a chance to block basic attacks with claw block.
I really think these characters would make the game much more exciting with the potential zoning control for certain maps and teamfights. Let me know that you guys think.