On the topic of Yu Yu Hakusho,many traits of the characters in that anime,carried over into the main protagonist of hunter x hunter,also know as Gon.
And many other side characters also have similarities throughout the series.
For the main characters though.....
• Gon,is similar to Yusuke.
• Kurapika is similar to Kurama.
• Leorio is similar to Kuhobara.(if that's right?)
• Killua is similar to Hiyé.(if that's right?)
This similarities tend for both appearance and personalities in the characters.