So the character keeps their abilities as they are, and you have levels designed to challenge and incorporate them to get through. And they can fit into whatever genre works best.
Junkrat and Hammond for instance could have a destruction based 3d platformer.
Lucio with a Tony hawk/booping people off the edge style game.
Sombra with a stealth and teleporting based game.
Or whatever else you could think of. Who’d have the most fun game If levels were specifically designed around them?
Mercy, shed have to resurrect people Valkyrie 1.0 style. Basically like a Dragonblade where you dash around but its Mercy so you just fly around and rez.
Doomfist in a game with God of War-like mechanics.
I would want Doom in a fighting game. That hack and slash nonsense better fits Genji, imo.
Moira in a Bayonetta-like role but more science focused story line and character of course
EDIT: OHHHHH or take all of the Blackwatch heroes and make a “Tales of” style RPG where you get the Blackwatch heroes one by one throughout the game
Sombra, she could have a really fun cyberpunk hitman style game with hacking mini games and the ability to change missions for personal gain (similar to how she trips the alarms at volskaya in order to blackmail Katya.)
Symmetra an RPG that involves building up a vishkar city by day (constructing building, solving political conflicts etc…) and by night fighting off Lucio’s rebellion, there could be a system where you unlock different light constructs to increase your versatility.
Moira could have a game similar to PC building simulator where you build all sorts of genetic abominations in order to make soldiers for talon.
Mercy could have a clinic similar to those hospital flash games where you treat the different heroes.
D.va minigame, the one she plays in her sit emote.
Lucio Watch_Dogs game, where you ruin Vishkar plans and use music to gain followers, when you have enough followers you drive all of Vishkar out of the city.
Soldier and Ana could have a 2 player co-op game where you travel to different cities in different nations, dishing out vigilante justice and exploring little bits and pieces of each others lore.
Etc…
Sigma: Cool gravity-flipping portal-esque puzzle game
Ashe: Game where you have to manage the Deadlock gang and carry out heists to gain money/resources etc.
Wrecking Ball: Mech-fighting game set in the scrapyard
Hanzo, where you’d have to discover his past and be able to shoot traitors of the Shimada clan and have to fight Genji, his brother as a boss character.
Bastion tower defence (Throw Orisa in as DLC)
I’d love a free-running platformer (maybe open world) game as Lucio where you just skate around and try to build up the highest speed.
ASHE
God damn I’ve love to play a Looter Shooter or something like Doom Eternal with her gun and kit. I’d have a blast
A Jak2/3-style game with Junkrat and Roadhog, where each of them have specific abilities to traverse platforming and combat scenarios in a GTA-like open world of Australia/Junkertown. After the failed cart of jewels trick goes south, the two set off across the wasteland on a new quest, gather parts to build a mech to challenge the Junker Queen for supremacy. You also collect treasure along the way (the secondary collectable, like orbs in the Jak games). At the midpoint they manage to get into the mech arena only to have to fight Wrecking Ball and lose. Then Wrecking Ball decides to help them, and Junker Queen is the final boss. In the end Junkrat and Roadhog earn a place back in Junkertown.
You might be joking I am not sure but I would easily pay 40$ for a Mercy single player experience where she goes through war torn regions healing and rezzing people while shooting at the same time. In fact, she’d make a great borderlands 3 character. Sell her to epic blizzard. Not like you want her anyway
3d team tower defense game with torbjorn
or an arena fps evolved around pharah, basically give everyone a self boost concussion blast that’s on a cooldown and a limited jetbooster but have quake movement added to it and no hitscan weapons.
Symmetra creating cities. Or moira in an ultra fast paced fps where you one shot but every hero has huge mobility and moira would fade all the time (we’ll have to get rid of that primary fire though).
Genji platformer, he’s always jumping around anyways.
Sombra
Genji
D.va
She’s basically a flight sim. Try one of those Robotech games that fires missiles and guns everywhere.
Ashe
I think possibly Genji. Single player based around tanking or healing for bots would be really frustrating. DPS are the best choices, and Genji is one of the more fun to play. Especially into bots where he could feel really powerful.
Echo would also be super fun as a SP campaign.
A zombie apocalypse game where you play as Bastion would be cool. Mowing down the undead with that powerful machine gun…
Hanzo in a thrid person stealth game. Since he has a bow he is quiet, and you have a skill tree for unlocking various stealth take downs, arrow types (scatter, sonic, plus stuff that aren’t in the game like a explosive arrow, a gas/smoke arrow, a flashbang arrow), and a skill stree for abilites like his storm arrows, wall climb, leap and watered down dragon strike ability.