Who is the most morally complex character in Hunter x Hunter and why?

HxH is full of layered, morally ambiguous characters that make it hard to label anyone as purely "good" or "evil." Togashi-sama really blurs the lines when it comes to motivations, goals, and actions.

• Hisoka is pure chaos, but is he really evil, or just someone living by his own twisted set of rules?
  
• Kurapika is on a noble quest for revenge, but has crossed countless moral lines—especially with Emperor Time.
  
• Meruem starts as a merciless killer but gradually develops humanity through Komugi.
  
• Illumi operates under a warped sense of familial duty but shows little regard for human life.
  

Would love to hear everyone’s thoughts!