First game was d.va, tried doing some kind of pyromancer dva build with the lava trail and specing hard into ability power, it seemed okay but I had to pivot into defense matrix upgrades around halfway
Second round I did some unhinged Orisa build where javelin spin was just this nuke button where I fly into the crowd then overheat and light everyone on fire and put down a barrier. Definitely gimmicky but very fun and it was actually fairly skillful trying to position the barrier at a good place and be in position to light people on fire and not die in the overheat downtime. You can seriously spam the barriers like every 5 seconds if you play it right