[WARNING: SPOILERS AHEAD]
First thing I need to say is, wow, my tears ducts have run dry after this I swear. I just finished and went back to do all the endings and I think my favourite would have to be ending #4 with Esra. I remember them saying Esra was modelled after a human mind, and I like to believe some parts were of Ash. The quote especially for ending #4 "In a distant land, a garden, free of weeds, grows new and unique flowers. I watch them with you." makes me want to believe Esra and the MC were able to find companionship (maybe some love) and happiness in each other in that last life together, with a special emphasis on just being able to chill after everything that happened.