your tags about mercy being one of the most complex characters- YES!!! theres a log in one of ana's gun inspection modes where it mentions how mercy DESPISED her healing magic/science being used for evil on the battlefield, and there's an ingame line of her saying "power boost working as envisioned!" and it just reminds me how she was lied to, forced unto the battlefield when in reality she just wanted to help people with her inventions and thats the only way they said she could do it. AGH. Hippocratic oath!!
Which is why I never seriously bought into Moicy (I get the hatefucking though) as a serious ship because realistically, Mercy would absolutely abhor Moira with every fiber of her being.
This is gonna be a really hot take for gay Overwatch-knowers, but. I preferred when Moira didn't exist as a character in the story and her whole selfish philosophy of 'progress at any cost' existed as Mercy's darker side. I was really interested in Mercy's 'holier than thou' demeanor (her battle uniform is an angel costume, for god's sake). I found it so interesting that Mercy was the one who turned Gabriel into Reaper (it was assumed canon until retconned by Moira). Or that Mercy "saved" Genji by installing ninja stars into his knuckles and turning his body into a killing machine (which is why, imo, I don't think Mercy would ever be in love with Genji. He'd be a constant reminder of the power she holds yet tries to ignore, the ways she's unbelievably fucked her patients up in the past. A reminder that she's not as good a person as others believe her to be). I'm personally really into the idea that Mercy has two sides in her: the side who truly cares about healing people and the side who's so full of hate and anger for the perceived enemy that she unconsciously fuels her rage into the people who rely on her. Turning people into living weapons to "fix" them and fight her battles. Reminder that she watched her parents walk out on her as a child to volunteer medical work for the Omnic Crisis, only for them to die and leave her orphaned and alone. Is she doing this to take care of people, or is she doing this to avenge her parents (the official site says it's only the former, but I think that's boring as fuck)? I think it can be both at the same time, but sometimes she prioritizes one motive over the other. I think the "angelic, cheery healer" is a persona she instinctively uses to veil her selfish motivations, to everyone and to herself. Reminder that she was also lauded as a savant, a prodigy, a teenage genius who literally revolutionized medical science before she could legally vote. You cannot expect me to believe that she's truly altruistic, that everything she does is for the betterment of humanity and out of the goodness of her heart.
I don't think she's a malicious person at all, just someone who doesn't want to admit she has ulterior motives.
Anyways, she's not actually this interesting in the game or the story.