Chris Redfield's playthrough features Rebecca Chambers, the S.T.A.R.S. medic. Her assistance, while different from Barry's, can be equally vital, especially for healing and solving certain puzzles.
Rebecca will often appear in the Medical Room or other safe areas. She can heal Chris if he's injured, saving your precious First Aid Sprays and Herbs. She also plays a role in the V-JOLT puzzle for Plant 42; if you find the chemicals, she can mix them for you. Ensuring her survival is key to unlocking Chris's 'Good' ending. Like Barry, pay attention to her dialogue and any opportunities to interact, as these often lead to beneficial outcomes or progress in the story.