I think another red-flag for Robin would be dating someone with “evil” in their nickname.
True. Robin Hood seems like a noble character, both in legend and on the show. He only stole magic from Rumple in order to save the life of his wife and unborn child. He seems to be in the same league as Snow White and Prince Charming, who only sent their baby daughter to our world to give her her best chance. While I’ve grown to like Regina and even root for her to do the right thing, it would take a lot of redemption on Regina’s part for Robin to esteem her and admire her, let alone love her. Killing Tamara, no matter how much Tamara might deserve it, would be a bridge too far if Tamara is indeed Robin’s daughter.
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy