Tearjerkers

ML dies

If you ship the main couple it's a sad ending as they separate. If you don't (like me), it's a mostly happy ending.

both leads die

no one dies but it's an absolute tragedy anyway

ML dies

the leads are separated by time (FL returns to the present, ML remains in the past)

the leads are separated by timelines that run backwards from each other (FL dies in one part of the timeline)

the leads separate after the FL returns to her real body and the ML, believing her dead, fails to recognize her upon meeting her again 

FL dies

FL is terminally ill

leads separate

the leads get a happy ending but the drama is a tragedy (everyone else dies)

ML dies

the leads separate

the leads separate (FL returns to the real world, ML remains in the novel)

many characters die

there are two alternate endings, one tragic in which the ML dies, one happy in which he survives

one of the MLs dies, leads appear to be trapped in an endless time loop that will always end tragically

the leads are separated (FL returns to the present, ML stays in the past)

ML dies, FL ends up with the SML, so could be seen as bittersweet

both leads die

the leads separate

one of the MLs dies

the leads separate

FL dies (possibly ML as well, it's unclear)

ML dies

ML dies/vanishes

the leads separate 

ML appears to die

ML dies protecting the pregnant FL, she raises their daughter alone

ML never confesses and FL marries someone else in the end

there are two alternate endings - a sad one in which both leads die and the soul in the FL's body returns to present day alone, and a happy one in which the leads survive, and the soul returns and finds the ML's reincarnation in present day

happy ending for both couples but a very sad drama

the leads are separated by time (FL returns to the present, ML remains in the past)

FL dies

FL dies

the leads separate

ML dies

ML dies

both leads die

ML dies

ML dies

ML dies

ML dies

the leads separate

FL dies

FL dies, ML seems to be planning suicide at the end

one of the MLs dies

FL, ML, and SML dies

ML may or may not die, it's unclear and can be seen as open or tragic

FL is terminally ill

ML dies

ML appears to die (possibly open ending, it's unclear if he somehow survived or the other man just looks like him)

ML dies

one of the MLs appears to die (may be open, it's unclear)

FL dies

ML dies, FL appears to end up with SML in epilogue so could be seen as bittersweet

leads separate

the leads separate (they exist in opposite moving timelines (early meetings for one are later for the other) and die in different times)

FL dies and their child is taken away

many characters die

FL dies

SML who the FL loved dies, it's an open ending whether the FL ends up with the ML or not

ghost!ML vanishes

the leads separate

ML dies

the leads are separated (FL returns to the real world, ML remains in the fictional) 

both leads die

FL dies

the leads become enemies and are separated by time (FL returns to the past, ML stays in the present)

both leads die 

Angel!ML returns to heaven, other ML appears to die in the final scene

ML dies

FL and one of the MLs die

ML dies

FL dies

Ghost!ML vanishes

FL dies

ML dies

ML vanishes/dies?

FL dies

FL is terminally ill

the leads separate

FL becomes mentally ill and trapped in her life

ML is terminally ill, all three leads appear still as lost at the end as at the beginning

the leads separate

ML is either dead or critically wounded at the end, it's unclear

ML dies

FL dies

one of the MLs dies, other is terminally ill

FL dies

both leads die

FL dies

ML dies

the leads are separated by time (FL returns to the present, ML remains in the past)

the leads are separated (FL returns to the real world, ML remains in the fictional one)

ML dies

ML dies

FL dies, ML is prevented from adopting/raising her child who he was attached to

FL dies