Who would you ask out?

What sort of factors would you consider when asking a guy/girl out? Would you rather be friendly with them first or know them already? Do you shy away from really attractive guys/girls and only go for a certain range? Do you look for signs that they are interested or don't care and just want to take a chance? Would you rather they be alone or with friends? Any other techniques or qualities I missed?

For this question I'm mainly interested in how girls would answer because guys more commonly do the asking but guys feel free to answer too. And if you don't ask guys/girls out, imagine what you'd look for instead of saying "I don't ask".
Who would you ask out?
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