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"Red: Your dweller is sad, cheer them up."Yellow: Your dweller is doing okay, but could be happier."."Green: Your dweller is happy, way to go!".Happiness icons are color coded, for easy reference: Assign them to the training rooms for some book worm or physical training. If they are sick, a little RadAway and/or stimpaks will increase their happiness.Whether you’re a newcomer or a long-time fan of the Fallout universe, this Bethesda installment has a lot in store for you. If they are in any other room, their happiness will raise to at least 75%. Equip them to explore the Wasteland, collect rare items, defeat various enemies, complete quests, grow your population, and protect your home. It will lift their spirits and make them happy.
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Overall it is best to have a well rounded special character exploring (as it says in the game) and a higher level character corresponds to more health in general. What has been said about endurance, strength, and luck are true in my experience. I assume that charisma impacts the frequency of encountering non violent scenarios that give you xp ( like when you patch up a run away slaves leg.) Intelligence/perception may also play a role in your ability to defeat harder enemies, like murlocks without taking much damage if any at all.
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I have a hunch that agility improves your chance of escaping unscathed from a tough battle ( particularly the longer you are out in the wastes).
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