Yusuke Is getting a awesome jacket and two pair of gloves: Fingerless and normal.

Keiko Is getting a desert cookbook and a recipe journal

Botan Is getting hair band, ties and other accessories plus a chest to hold them in.

Jin Is getting a wide assortment of jerky

Kuwabara Is getting a pair of combat boots and running shoes.

For anyone I missed poke me here so I may fix my mistake. This will count to people that Killua had several conversation or taken interest in.