Mokona has plenty of money saved up from her job so she just got things for everyone she knows. If I forgot anyone they probably got cheap booze or candy depending on age.

Catherine: Backcountry moonshine. The burning means it's good for the sinuses.
Dave: A joke book. One of the terrible ones full of wholesome puns.
Danny: A bag of fun-size chocolate bars. The inherent lack of fun in the size is counteracted by the volume.
Ed: This is totally a Snuggie.
Hiroshi: A little plastic pirate ship for Montfort's house.
Isaac + Miria: A disguise kit that is mostly false mustaches.
Jr: A large bag of caramel popcorn.
Karkat: A large bag of gummy worms.
Kyon: A Sirocco-brand version of Clue.
Palom: A pogo stick. THE END IS NIGH.
Rin: Football pads. She should stop getting hurt all the time!
Rosalia: A book on business and accounting.
Rozalin: Fancy soap.
Ruby: A variety of treats for all his pokemon. And a DVD of King Kong.
Saleh: A bottle of disappearing ink. It's labeled as such, but… in the disappearing ink.
Shampoo: A large jar of assorted flavoring-covered pretzels.
Tsuruya: Flavored lip gloss. It's advertised as being strong against chapping in cold weather.
Vriska: A pair of wheeled shoes. Same size and color as the ones she always wears.
Yoshika A mild perfume that smells a bit like marshmallow.