He's not a blank slate and spends most of the series either being depressed or suffering from PTSD. Sometimes both. He spends a entire arc crippled in a wheelchair after blowing up his brain due to self-loathing over being unable to protect his best friend.

>>216134057
>>216134119
https://youtu.be/9EOZN70qNPg?si=uC7FDiluFjxaI4IS

the fallen swordsman edition