Hunter Exam arc

• Illumi has done Hisoka several favors
  • Steering the ship when Kurapika got knocked out
  • Fourth exam regarding the name plates
• Illumi says he and Hisoka hasn't known each other long

Celestial Tower arc

• Hisoka's loyalty lies to nobody
• Hisoka and Machi has a sort of thing

Yorkshin City arc

• Spider massacred the Kuruta clan 5 years ago
• Shizuku is replacement for the last member #8
• Hisoka becomes member 2 years ago to replace #4
• 3 years 2 months since the 13 last saw each other, although there are changes in members
• Silva assassinated a Ryodan member 2/3 years ago (via Killua)
• Zeno and Silva almost killed Kuroro
• Pakunoda and Ubo died
• Illumi said "I've known you (Hisoka) longer than Kuroro." They know each other.
• Kalluto is present when Illumi stood in for Hisoka

Greed Island arc

• Shalnark, Shizuku and Koltopi went to study how the island's system works, to which they found out that the special items in the game can't be inhaled by Deme-chan because they are made out of nen but it can inhale the common inanimate items. Also, Koltopi can replicate cards but these cannot have the power of real ones.
• Kalluto is out of Kukuroo mountain and is the new #4 Phantom Troupe member.
  • His Nen abilities are undisclosed but he was able to track down the Nen eraser Kuroro needed.
  • Hinted that he is in search of his brother Alluka who ran away.

DUNNO YET ABOUT THE CHIMAERA ANT ARC