as i was watching hunterxhunter just last week... i think that a lot of skills/abilities from naruto originated from hunterxhunter.
kurapicas red eyes ... its sorta similar to rasengan... both being red... and gives off a special skill once activated.
killua's electric atk... sorta similar to sasuke's chidora. but using condensed energy in the hand to form a lightning chakra/nen ultimate atk.
group of 4 as a team. Leorio kurapica gon and killua / kakashi naruto sasuke sakura. kakashi and leorio resembles ldrship and wise. naruto sasuke and gon killua resembles growth and kurapica and saukra resembles intellgence,
the ryodan and akatsuki. both being a villainous group filled wif S RANK CRIMINALS or HIGH bounty indivduals.
Chakra/Nen `` both needed to execute magic/skill a term for energy within both anime's
there might be more ... but these are some points that i figure was quite similar.....
please discuss ^^ ` dunt flame me if it was already emited ....