Jump Superstars

While starting Training mode through the deck maker, hold Up or Down to change it to a knowledge character or Left or Right to change it to a laughter character.

Get 200 koma to get the Goten help Koma.

The following are Komas that can be unlocked from doing something other than beating J-Adventure mode missions. The easiest way to get the "Battle [number] times" Komas is to repeatedly fail the "get hit once and you lose" missions in J-Adventure mode.

Ichigo Help Koma: Get 450 Koma
Ichigo Battle Koma: Get 540 Koma
Vegito Battle Koma: Get all Koma
Goten Help Koma: Battle 200 times
Bobobo Battle Koma: Battle 350 times
Naruto Battle Koma: Battle 400 times
Don Pachi Battle Koma: Battle 450 times
Sasuke Battle Koma: Battle 500 times
Kakashi Help Koma: Draw a Konoha leaf emblem in the upper right part of the touch screen during the introduction sequence. Alternately, get 360 Koma.
Sakuragi Help Koma: Draw a basketball shoe in the lower left part of the touch screen during the introduction sequence.

When you break open a crate, barrel, or any other object that makes items pop up, immediately hold Guard. All harmful items, such as the weight or poison, will land on you and disappear without any effect. This also works on helpful items; it works on everything except for bombs.

Collect 450 koma in J-Adventure mode.

During the introduction, press L or R to change the color of the ink you use to scribble on the bottom screen (with the Jump Pirate face). The initial color is white; the other colors are black, pink, blue, cyan, green, yellow/orangish, red, and gray.