>>120149062You can solo pretty much everything but the bosses easy enough, though you might have to buy a lot of forts to hold DOEs at bay. You might also be able to kill a few on the way down with anything that has two sources of ailments/binds/element links. Often a Landshark in a fort is enough to take on a DOE with some good equipment and at least two types of element links to apply.
Protector is near impervious to damage, they just have a nasty problem of going hungry constantly so you need to bring a lot of food items to solo with one.
Ninjas are incredibly fun to solo with because they have a lot of different kinds of attack and movement options, including water walking.
Gunners can handle most types of situations and attacking from range itself is an incredibly powerful option, but a lot of their damage comes from upgrading their guns through forging, melding and scrolls.
Medics can use shields and medium armor, but their weapon choices are pretty lackluster so their battles might be even slower than a Protector's.
Most other classes are at least useable alone, though Sovereign won't get much use out of its orders that way and is better off sticking with imbues, passives, and using Regal Radiance for AoE.
Runemaster's Volt skills all allow you to stun and run from anything that might be too annoying to kill, or even to stunlock certain things to death if you're alright with burning through TP to do so.
Wanderer is just great for navigating the dungeon in general since it has skills for digging and water walking.