Persona
It is just a small little cylinder. If it is absolutely happy, it is calm and quiet and shines blue.

Over time, if it doesn't receive attention, it changes its mood gradually and glows in other colours. Owner can affect its mood and make it happy by playing with it. “Jumping game” and “IR game“ are the games which owner can play with it. Owner should play these games with it, unless it will get tired of one of the games and flash, and its happiness level will not increase anymore.

It even gets tiered from playing, and you should leave it alone for 15 minutes. In case it gets sad, it will start making noise and flashing red and then melting from top to bottom.