Yashwanth3366 commented
I consider punisher as the loneliest superhero as he lost his whole family and spent his whole life with vengenance
sidat commented
Spawn
sidat commented
Mr Immortal cause everyone he loved is dead and he will live until the end of time by himself
bhagatsingh123 commented
Batmann
I think it has to be Batman
Now we know he does has friends but keeping his past in mind I think he is the loneliest superheroe