A crew member’s portrait color indicates the potential star-rating of a crew member:
- Gray (Common): 1-star maximum
- Green (Uncommon): 2-star maximum
- Blue (Rare): 3-star maximum
- Purple (Super Rare): 4-star maximum
- Gold (Legendary): 5-star maximum
Gold crew have the greatest stats, and can be improved the most, while gray crew can never grow beyond their one-star capability.