Experience points (EXP) - a common way of counting your progress in the game, so it's a part of the Bub-Chi's ranking system.

Each of your Bub-Chi can get EXP and then level up! Some of the level-ups will give you special bonuses and items.

Each Bub-Chi starts with no level, or lvl 0.

EXP needed to reach a new level:
 1st lvl - 100 EXP;
 2nd lvl - 200 EXP;
 3rd lvl - 300 EXP;
 and so on.
This is the amount of EXP that you need to get per lvl. So if your Bub-Chi is lvl 2, they need to get 300 EXP to get to lvl 3. Or in other words they will need a total of 600 EXP to reach lvl 3.

Bub-Chi will get EXP for:

  Making art with them.
  Finishing quests.
  Participating in the events and prompts.

While the rewards for quests, events and prompts are fixed, artwork rewards are counting like this:

1. Basic reward will be proportional to the amount of   earned for the artwork. (see the guide here - Libbles and coins - group currency)

For each   Bub-Chi will get 10 EXP. So 10  = 100 EXP.

This amount of EXP will be given to that Bub-Chi for which the artwork was done! You can't transfer it to the other Bub-Chi, even if they are yours too.

2. If there are two or more Bub-Chi featuring, the amount of EXP will be multiplied for 30% for each Bub-Chi, and then shared among them equally.

Example:
Currency earned for the artwork - 20 , number of Bub-Chi - 3.
Total EXP: (20*10)*1,3*1,3 = 338
EXP for each Bub-Chi: 338/3 = 113

If you made art with both your and someone else's Bub-Chi, EXP will be counted excluding Bub-Chi that isn't/aren't yours.
In other words - 30% bonus wouldn't work for these Bub-Chi.
 That doesn't affect the basic EXP, which still will include bonus from multiply characters.

For keeping track of all EXP your character gets you will need to register your character!

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Rewards:

For now rewards list isn't full and may be updated with new items later!

 1 lvl reward - x1 Tamer collar

 3 lvl reward - x1 Coloring potion
 5 lvl reward - x1   and  x1 Tamer collar
 7 lvl reward - x1 Rare Trait upgrade
 8 lvl reward - x1 Rare Companion MYO by your choice: either Shiftgem , Mothpearl or Perfairy .


 9 lvl reward - x1 Coin



 10 lvl reward - x1 Tiny Time Sparkle