Ash is super annoying to deal with. Her damage output is surprisingly high for a tank, but only at close range(unless they have slug shot). pick her off from a distance if at all possible. if not then wait for backup, you Will need it.
Any good Drogoz player will open with a Fire Spit and Salvo combo, you NEED to get away from this as it has the potential to do 2,400 damage. Use FrostFire glide first to escape this, and then pick him off while his gun is on its cooldown.
Terminus is a very good match up against Imani. With his ability "power siphon" which absorbs her attacks, and even her ultimate.
Terminus just can't reach Imani very well, but can kill her with his ultimate.
Your ult is arguably worth much less than vivians ult in the long run, so letting her keep the drones up is a bad idea. If you have your ult when you hear her pull out her drones, seek her out and use your ultimate to kill her and her drones quickly.