Gon:
I am a traveler. Im always exited for a new adventure. I needed to stay in an island for a while. I didnt want to be late so you quickly run to the dock(?) And get in a ship. After a while i learned that the ship is heading to 'whale island'. I went to the side of the ship, i closed my eyes and enjoy the breeze.
*time skip*
After a while i arrive at whale island and got of the ship.  I am just walking while admiring the place 'this place is so cool!' I thought as i accidentally bumped into someones back. I stumbled and didnt fall "I'M SO  SORRY!" yelled both of us at the same time as we bow. I look up to see a boy in green.
We scrached the back of our heads and introduced ourselves "sorry about that miss-?" "Oh my name is (y/n)" "mines gon!"gon said "are you new? I havent seen you here before." Gon ask me "yes. Yes i am, im going to stay for a while here" "do you have any were to stay?" "Actually n-no" i said as i scratch the back of my head and sticking my tounge out "then you can stay with me and mito-san!" He exclaimed cheerfully "i-i dont thi-" i didnt get to finish as he drag me to a house.

Killua:
You are an assasin, but you never look like it because of your cheerful attitude and cute face. You are skipping your way to your next target
Ronald gilbert (made up name). He made a deal to your family but ended up swindling them by trading a fake island,your mother said to torture him to death, he is also one of the ten dons. You look at his picture again and made your way to his estate or mansion. You got inside the mansion without notice from the guards and quickly found his office. You were hiding in the shadows concealing your presense. You saw him in his office and quickly pounce on him "scream or move you will die" you said in a dark tone. You were about to kill him until "OI WHAT DO YOU THINK YOUR DOING HE'S MY TARGET" yelled a boy with white hair "yeah but i got to him first" you said bored
"I got here first!"
"Did not"
"Did too
"Did not
"Did too
"Did not
"Did t-"
"GUARDS" ronald screamed.
But before the guards came you and the white haired kid ripped of his head/heart "why his head?" The white haired kid said "why his heart?" You smirked. Then you both said "mom"
The two assasins suddenly heard banging and yelling outside the office. The guards broke down the door only to see a man with no head or heart and an open window. The two assasins were jumping branch by branch."the names killua" said the boy "call me (y/n)" you both smiled to each other and depart.