Roxy

has 400/1080 (Min/Max) units of health and wields dual regular assault rifles dealing 35/94 (Min/Max) units of damage. Regular weapons cause 100% of their damage against flesh targets and no damage against shielded targets.

Roxy's fast attack gives her firepower in a class above Frisky and Rico.

can be found at the Kingpin's Hideout to the left once you see Kingpin. Once you find her, you can recruit her for 5000. Unless you have Spidey, you will be well served using her as your partner against her former boss.

Training
A partner's rank can be upgraded at the Training Range, increasing the partner's health and attack damage.