I saw it as slice-of-life / adventure / let's see what happens. I'm fine with anything, as long as it doesn't turn into straight-grimdark or straight-romance (though I am fine with either if they don't become the premise of the rp)
As for Jade's abilities: he's never been trained to fight, but his special talent is in exotic and foreign magic (with his primary discipline being dragon fire (which is, like, totally better than regular fire, doodz)), as well as a strong knowledge of regular boring Unicorn magic. So, basically, he's not a fighting pony, but is certainly capable of defending himself. I'd say he's probably the strongest offensively, as you said.