I don’t know if it is just me but I feel having an emotional story or at least a part that pulls at your heart-strings makes it memorable and worth the read.
I will just list the Stories where I was I was a mess of emotions.
Fallen Hero: Rebirth
The whole ride through was a rollercoaster of emotions. The flashbacks and choices did NOT save me. I went with the Ortega Route. It is as @Camille622 said, the MC has the option of loving Ortega but no matter what, is unable to tell them their feelings because ultimately they are not human/diminished and do not deem themselves worthy to be with a human The can only love the RO from afar. Although the concept of the puppet was also a big OOF, I’m sure there are some of us that think life would be different, easier if we looked a certain way or looked like someone else. 
Study of Steampunk: Choice by Gaslight
One word: Finch.
You all covered the rest.
The Eagle’s Heir
Similar to Fallen Hero in a sense but less intense yet still makes me cry.
You have the option of romancing the heir whilst you’re just of lower status.
You can either protect him at all cost or not but the content is well written although I found the ending a bit ‘meh’.
The Harbinger’s head
a Bittersweet death.
Here are some promising WIPs for that sad soul.
Son of Satan: Mortal Coil by Dae-kalina
Ramiel ANGST. Nuff said.
'Til death do us part by will
Oh the feels I get with this one…I’m so lonely. They all leave me
Model Citizens: Unmasked by RenaB
There is the option for the MC to cling to their old wedding ring and feel stuff.
Considering I read this right after I read Fallen Hero …. feels.
and finally of course
Fallen Hero: Retribution by malinryden
for obvious previously stated reasons.