Same here. (and the bear and the imp have the same stats, 4hp, 4 attack(?), no defense)
Yeah same thing here. But if you look on your enchantment page, it shows they are filling a slot. So when they die, the spell goes away and you can then resummon one.
As far as what they are capable of, I would just shrug, it's just place holder stuff. That's why the bear's have no depth and are just a copy and paste of the Imp.
Though in my feeling, I think you should be able to summon a few of them before it hit's the threshold cap. But again that's part of balancing, and were just getting placeholders to fill stuff in for the interim.