Any NPC's you wish you could have romanced?

To be fair, he gives all of those things to you. You don't steal them.

Kasumi is god tier waifu.

Kai Leng.

 yeah, I think Aria's personality would be as rough as her appearance. But in the Omega DLC, when she kisses your Shepard, I thought that was a pretty sweet moment where she lets her wall down and basically said, "fuck it." 

I wish there was a DLC that adds Aria as a possible romance option. And in the DLC, you could just get to know her better and just be there for her... 

Hmm, I remember reading a fanfic a long time ago which focused on the complexity of Aria/Shep relationship. Lots of angst and tension, as I recall, because Aria simply refuses to change for anyone, paragon Shep included.

And I'm all for Aria romance

All of Palaven was neglected. I have to invent a whole story in my head of all the cool things that happened. Staring with Reegar.

I've been spending too much time in the DA2 section, I think ManShep should be able to run off with Brynn Cole. She's too good for Jacob.

Two come to mind immediately ... Aethyta and Bakara.

Aethyta because she's a total badass and sexy as hell. I've always thought it was a shame that there wasn't an option to get her on Shepard's team. The Normandy even had a bar she could've tended.

Bakara would've been a really interesting romance, I think. Tough, strong, and she knows how to use a huge shotgun. But at the same time, calm and level-headed. In conversations, she actually sounded friendly rather than angry/threatening like most krogan. Also, it would've been a chance to show a different type of romance, with the two of them connecting on an intellectual and emotional level where physical appearance isn't a factor (or if it is, it'd likely happen after the emotional/intellectual bond forms).* And it'd also be cool to see a krogan character on the team who takes a more thoughtful approach rather than roaring and charging full-speed-ahead.

*Granted, FemShep had that with Garrus, with them being good friends before any romantic feelings came up. But MaleShep didn't really have that with any of the female LIs.

It felt like getting flipped off by Bioware when they brought back Femshep's sleazy side in force. *sigh* It's a minefield of degrading behavior to avoid for her.

Oh that's fine as a choice, not as the default behavior like the way they made Shep canonically pro Alliance and far too polite to nearly everyone.

Jenkins, right before he got gunned down by those damned geth!

FemShep can date rape Vega?  That's so messed up.  I guess this is why fraternization as a rule is a legitimate thing.  MShep at least has dinner with Kaidan before taking things further.  Hell, that relationship was three years in the making!  Well, I suppose this is one way to make male and female Shepard different.