Out of 9 responses so far:
For the philosophy 8
To follow the Skull Knight's story 8
For the art style 8
To follow Guts' story 8
To follow Griffith's story 6
For the mythos 6
For the mystery 6
To follow the Godhand 6
For the demons and other monsters 6
For the violence 5
For the revenge 5
To follow Casca's story 5
For the friendship 5
To follow Shierke's story 5
To follow Serpiko's story 4
For the Medieval setting 4
Because I follow Miura's work 4
For the magic 4
To follow Farnese's story 4
To follow Rickert's story 3
The Medieval setting 3
For the light-hearted moments 3
For the religion 3
To follow Puck's story 2
For the sex 2
For the romance 2
For the political intrigue 2
For the nudity 1
To follow Isidoro's story 1
To follow Ivalera's story 1
To follow Rodericko's story 1
For the loli 1
For the comedy 1