Pegosaurus
Banned
If Kurapika's eyes turn red for any reason (say, Gon's in trouble, or something) he's basically a Nen god.
Aside from that, the only ability specific to the Phantom Troupe is Chain Jail / Judgment Chain. The normal chains, Holy Chain (able to heal basically any injury), the Dowsing Chain (not particularly useful in battle), and the abilities on his other three fingers which were never actually shown would be usable in a normal fight.
Aside from all that, he's just good at fighting period. Uvo broke his arm and he didn't even wince. He's super fast, moderately strong, and very intelligent.
This is partially wrong. Chain Jail [Middle Finger] can only be used on the Spiders. That was the restriction he set, and is also why Uvo couldn't break the chain. Judgement Chain [Pinky Finger], however, can be used against any opponent, the restriction instead being that Kurapika can only use the ability when his eyes are Scarlet [Emperor Time]. Kurapika also states that he trained to be able to deliberately make his eyes scarlet, but it greatly drains his energy. This implies that Kurapika can activate Emperor Time whenever he pleases, but it will also activate when under extreme emotional stress, but he can't keep Emperor Time active for too long without sustaining injury (remember how he passed out during the York New Arc?). Kurapika is a very capable fighter, and we still haven't seen his Index Finger chain, so I'm pretty confident that he can keep up with Gon and Killua, we just haven't seen him since they left York New.