Even though she's good for RoR2 beginners for testing out battle mechanics and though she's good at dodging attacks and shooting at long range her starter health is low as hell, Mercenary (right character of the image) has the lowest of them all but highest damage, resorting to completely melee-skilled combat.
Mercenary is classified as the hardest character to use because of his really aggressive, fast-paced and close-quarter combat mechanics.