Enter one of the following codes at the "Options" menu in Gru's Lab to unlock the corresponding cheat function.

Minionettes costume
Enter Right, Right, Left, Up, Down as a code. The costume can be select at the "Bonus Content" option at the "Hub" screen.

Village Folk costume
Enter Up, Down, Down, Right, Down as a code. The costume can be select at the "Bonus Content" option at the "Hub" screen.

Taffy Web Gun
Enter Down, Right, Left, Down, Up as a code. When this code is activated, the Web Gun in Gru's hand is replaced with a pink version and the HUD icon for the Web Gun is replaced with a pink version. Also, the Web Gun effects on all objects, enemies, and Minions as well as the Web stream/shot itself are pink instead of white.

The Final unlockable item is The Taffy Web Gun. When unlocked, the following effects are seen by the player:

New HUD Icon - The HUD icon for the Web Gun is replaced with a pink version of the Web Gun HUD icon.
Pink Web Effects - The Web Gun effects on all objects, enemies, and Minions as well as the Web stream/shot itself are pink instead of white.
Retextured Web Gun - The Web Gun in Gru's hand is replaced with a pink version of the same gun.