The green bar represents your character's Health. As their Health deteriorates, the bar will turn yellow, and then eventually red when the character is in danger of dying. The blue bar is the "speed bar." It indicates who will attack next. E.g., the first opponent with a full blue bar will attack before others whose bar is less filled. Green icons represent temporary positive effects while the red icons indicate a temporary negative effect. Clicking on the icon will give a brief description of the effect.