Anyway, let me attempt to go into more detail about Kurou since I've read the source.
First off, Kurou starts the fight by entering Magius Form (wings, sorcery, can use his equipment) instantly, without question. He also summons either Scimitar of Barzai or Cthugha/Ithaqua to start the fight; not sure which he'd prefer. He won't summon Demonbane unless he's getting his ass kicked, but he has shown willingness to summon it even against human-sized enemies.
Atlach-Natla: Spider web; not that hard to cut, but really good at slowing stuff down.
Mirror of Nitocris: Illusions; he can also use it to reflect beams.
Scimitar of Barzai: Flaming sword/boomerang, really sharp, also makes him better at sorcery.
Cthugha/Ithaqua: His go-to weapons, a pair of guns. By default, they both have six rounds before he has to reload; Cthugha shoots flaming exploding bullets, while Ithaqua shoots freezing homing bullets. He can also use a limited number of God-Beast shells, which summon the true form of the weapons; he wiped out at least 100 minor gods with just one of the shells, and their default form is capable of taking down one of the mook mechas even while Kurou is at his absolute weakest.
Shantak (I think that's it): Lets Demonbane fly. He doesn't need it normally because he can already fly in Magius Form.
Timaeus/Critias: Shinguards for Demonbane that warp space/time, allowing him temporary bursts of speed. He can always use them to perform a powerful flying kick.
Shining Trapezehodren: Doesn't actually erase things from existence, but if he hits them with it, it warps them into an inescapable prison outside the universe.
I can't provide details about Athleta Aeternum because it's probably from the sequel.
Also, Kurou has access to low-level magic, which he mostly just uses to cancel out enemy spells and occasionally to set things on fire.
In terms of speed, pretty eh. Magius Form's fast but nothing absurd; Demonbane can reach supersonic speeds without much difficulty while it's flying, and is very fast during the burst of energy from the shinguards.
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"As the size of an explosion increases, the number of social situations it is incapable of solving approaches zero." -Vaarsuvius, Order of the Stick