While this isn’t a helpful response, virtually any character works on any given level if you understand the fundementals of the character your playing and the structure of the missions.
There are only a few characters I’d never want to pick up in PvE whatsoever, primaily Ambra & Kid Ultra due to their poorly suited primary attacks which has low damage and can’t crit which is detrimental in PvE. Galilea is another no-go and possibly Beatrix.
My main suggestion is to virtually always run health regen. It makes things a lot easier and you don’t have to rely on health drops or worry about going in without a healer.
My personal list of the best characters for the missions;
The Algorithm
Marquis, Montana, Oscar Mike & Whiskey Foxtrot.
The Void’s Edge
Caldarius, Oscar Mike, Orendi, Phoebe & Thorn.
The Renegade
Kleese & Miko.
The Archive
Attikus, Caldarius, Marquis & Thorn.
The Sentinel
(Benedict), ISIC, Mellka, Thorn & Whiskey Foxtrot.
The Experiment
Attikus, El Dragòn, Kelvin & Phoebe.
The Saboteur
Attikus, ISIC, Kleese, Phoebe & Toby.
The Heliophage
Alani, ISIC, Marquis, Montana, Oscar Mike, Toby & Whiskey Foxtrot.
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Attikus and the Thrall Rebellion
Caldarius, Deande, Oscar Mike & Toby.
Toby’s Friendship Raid
(Benedict) & Mellka.
Oscar Mike vs. the Battle School
Caldarius.
Montana and the Demon Bear
ISIC, Marquis & Thorn.
Phoebe and the Heart of Ekkunar
Alani, Marquis, Oscar Mike, Thorn & Whiskey Foxtrot.
As said though, those are what I would deem to be top picks, and there are a lot more good choices for the different missions.