
Shues are like a personal pet that your character has. When you start out, you see them as a egg and they level up in the same way that your character does, excepting slower depending upon how much xperience your character accumulates.
Shue hp (red) will show up under your characters hp bar. When you are in battle, shues will take some portion of the damage for you, and recieving xp. when a shues hp bar is low it will show up as a alarm sound and a message on your screen. At this point you can press 3 to feed it a hp potion ( from your own hp potion stock ) OR wait until another alarm shows up telling you your shue has 5 hp. If you still dont give it a hp potion in time, it will die.
To revive a dead shue, you can use a shue revival potion.This will ressurect your shue once but you lose all the levels and xp your shue had accumulated.
Occasionally you will have to feed your shue to prevent the grey bar from falling.
Once your shue is full grown, you can breed it with another shue to produce .... a super shue ?? haha, I dunno at the moment since apparently your shues have to be pretty high level for that to happen.
At the moment , this is what i know about the shues. I saw a full grown shue in action at the side of gm scala during the game once. That was on scala's mage character and it was an owl. However, i didn't get the chance to see it in action yet. So stay tuned for that.

Hope this helped. Let me know if there are other topics that newbies at this game want to know about.
