Or what I want to happen. Heh. Indulge me. Mind you, I have only watched the original series (scraps of OVA, read none of the manga).

• Basically this is for when Killua promised his dad Silva he won't betray his friends. There's definitely conflict there.
  • Killua will one day have to betray Gon.
  • Or Killua will disobey his family in order not to betray Gon.
• Kalluto hates Killua. I think there's repressed/discreet hatred going on there. Kalluto seems to be someone who will be the most angry at Killua for ignoring/disregarding their mother.
• Killua will kill a family member. Kalluto? Illumi? His father Silva?
• Hisoka will duel with a long line of great Nen users.
• Hisoka will defeat Killua. It will be epic.
• Gon will be a villain. He will be destructive.
• Gon will defeat Hisoka.
• Hisoka's final enemy will be Illumi. Or Gon in #7.
• Kurapika will defeat Kuroro. It will not make him happy.
• The last scarlet eyes will be the end of Kurapika.
• Zeno will die. Random.
• Illumi will die at the hands of Gon. It'd be ironic because he almost got rid of Gon early on.
• Killua will die in the end. Maybe it will be connected with #2 or #5. But Silva and Illumi will be outraged.
• Spider, Silva, Illumi, Alluka, Hisoka, and later on Kalluto. Something tells me they are all connected with each other two/three years ago.
  • Silva was stated to have killed a Ryodan member "two or three years ago" during the Yorkshin City story arc. Either Hisoka (who "replaced number four two years ago) or Shizuku were his replacements. Now, as to the former, I'm not sure if Hisoka was assigned or he defeated number 4.
  • Illumi and Hisoka must have met through #14. Illumi said they don't know each other that long, but he knows stuff about him.
  • Alluka Zoldyck may be involved in #14 as well.
    • Wrong. 321 revealed that Alluka has been hidden in Kukuro Mountain all this time, not allowed interaction with anybody even the family.
    • Kalluto may not have been informed of Alluka's whereabouts.
    • Alluka may not be involved with the Spiders after all.
  • Confirmed: Kalluto Zoldyck joined Spider in search of Alluka.
• From the manga, Gon might lose his Nen. If he did, how does he get it back? Nen eraser like how Kuroro is dealing with his? Less likely. How about a healer? Who is a possible healer? Leorio. :) I came up with this idea upon rewatching episode 7 where there was an exposition on Leorio's reason to be a hunter. He wanted to be a doctor and cure "sick children." Gon has helped him a lot in the past.