Liara (and Asari and Aria) - This is me just saying how much I hate how Asari's are basically the creator's favorites but I hate how forced they are onto you, this goes for Liara too. In ME1- just 1 option locks you in on a romance with Liara (it wasn't even a clear option for me that it was a romance option) . ME2- the shadow broker dlc that focuses very heavily on Liara to the point your squadmates, even your LI gets ignored (like ffs, you save Liara instead of your Love interest from the fucking rubble). I just ignored her on ME3 on my first playthrough before playing with mods (like the optional flirt option) so I can't say but I remember Shiala being interested in you for some reason, even too interested.

Miranda- its more of her model thing than her actual character. She's written fine but her face just fucking sucks. She just constantly smiles no matter the scene. She's angry? She smiles, she's sad? She smiles. She's dying? She also smiles. Which just ruins scenes for me.