What's the character with the least red flags to romance ?

In your opinion, if you were to have a stable relationship with the romanceable companions. Which are the ones you think have the more forgivable red flags? Which red flags made or break it for you for the others?

Feel free to just answer one or the other. I'm just curious to see if there have been some "flaws" in a characters personality just because I was fond of them, or perhaps they just sweet talked me into overlooking it.