He's an aggressive warrior type, of course, from the Iron Thorns, which is some sort of mercenary group. All of that could probably be gleaned from the original post though... honestly not much story to speak of yet. XD
I'm considering making some more Iron Thorns MOCs in which case the group and Teneu himself would be fleshed out a little more.
Edit: I will say that Teneu is definitely not a Toa, or at least wouldn't think of himself as one even if that were to be his technical classification. No elemental powers either, whether that's because he innately has none or because he exclusively uses weaponry and never developed his other abilities. I guess that the same would apply in-story: he doesn't know what he is and he doesn't care because the only thing that matters to him is doing his job. Breaking people with extreme prejudice.