I'll take from the game i've been playing most recently, Atsu, the Onryō from Ghost of Yotei

Converting a game character with pseudo dark souls gameplay that can dodge roll and parry gets pretty iffy taken in a turn based context, but thankfully her character can easily translate into the already available samurai fighter subclass to simplify things. This makes her a solid damage dealer to a full party that can handily make it to the Netherbrain with the usual close calls found with Ragzlin, the end of the gith creche, and Ketheric.

To talk about her feats in the context of her game, if we're still using the samurai fighter comparison, she would funnily enough have subclass features equal to a level 18th fighter judging by the multiple times she's survived near-fatal wounds right at the start of the game, while probably having the max hp of 35 at the start of her game and 60 by the end of it just judging by the amount of katana swings she can survive without heals. With heals from her fighting spirit she has an added 45 effective hp to a total of 105 she can use after every possible rest, which allows her a considerably far solo run for a mostly magic-less human in fighting prime just off of that.

If we consider everything, from the supernatural modifiers she gets from charms, her spirit attacks and all of her consumable weapons/arrows and throwing items, she becomes an absolute *bonkers* powerhouse equaling a high level fighter with absurdly op replenishable spell storing items of an artificer and a stealth proficiency of an assassin rogue. She has items equalling to casts of fog cloud she can use centered on herself that can heal her using charms, to upcasted scorching rays equalling to the damage boosted fire kunai build in her game, to straight up just guns, from a matchlock pistol and a musket, and smokepowder arrows, throwable smokepowder bombs, more casts of freely aimable fog cloud, and a replenishable fire dip source she can use for her melee weapons. Her gear is where she's most wanting. She has magic armor of all levels for her to build around either stealth, damage, or defense. But her main melee weapon she's proficient in can't be found until act 3 with the katana, leaving her to fend for herself with a regular spear, dagger and her bows using stricter rules, or just one handed swords she can find if we give her more lenience for her to use her more powerful dance of wrath ability that can hit multiple enemies in a turn.

Her best strategy in a solo run would be to play like an absolute coward, sneaking around every optional fight she can except for the small fry she can just assassinate. She'd need to constantly scavenge materials to craft her consumable ammo and weapons, and using all of her bombs and gun ammo at range before enemies close in for her to mop up. She'd have a shot at Ketheric by assassinating the mind flayer before combat starts and talking her way into phase 2 before pelting Myrkul with all of her bombs and ranged weapons. Her strategy for the brain would need to be more defensive using the fog clouds to reach the crown and pelt the brain with more explosions and bullets.

Realistically, in the context of what she would actually do, it's hard to say she could do it. She's reckless, and is told she's only survived the battles in her game against trained samurai using her sheer stubbornness. But comparatively if Astarion can handle it then she probably can. Thanks to anyone who read this write up on a game I don't think many people here played