Hmm, going by the "prophecy" as a whole and assuming I'm including each person involved, my guess is that Ryuu and Miley have some sort of meeting that triggers Miley's demonic conquest of the planet - either the roar is one of victory in which case Miley and Ryuu are on the same side, or the roar is in agony or is a warning in which case Miley likely kills Ryuu which triggers the events allowing her to begin taking over. (The world will be ran over with ice and fire(Miley) at the roar of the dragon(Ryuu),)
Something happens with Jenny and Addison that helps spark this. Possibly the two discover some previously unknown power that Toji inadvertently sparked - maybe during a confrontation involving all three, and one that he is powerless to stop. (The world was seen as black (Jenny) and white (addison) causing it to change faster the lighting(Toji) can flash.)
(As the world burns to it’s core and freezes its skin like the metal armed bearer(Leon) arrows will be aimed (Quiver) to the lifeless killer of innocents (RS) in order to bring the depths of Light and darkness back down to Zero (Kris).) This part is the most cryptic. it seems to imply that Robot Sniper and Zero are important parts of the destruction/conquest of Earth in that they need to be killed/defeated in order to defeat/stop whatever Jenny and Addison set loose/have become, though the implication is that Zero will be the one to stop them. It also heavily implies that Quiver will be one of the necessary heroes needed to stop this apocalypse. The reference to Leon has nothing apparent to do with his actions or role, so he's likely a wildcard who is prophesied to be there, but his actions are either irrelevant or unknown.
(Electronics will only be held to the controller of circuits (HW) to enable the metal soldier of hope (Riot) the strength to take down the white coat smoke (Roman).)
This makes me think that Roman is a huge part in helping Miley take over, and as such is critical in taking down. The rest is fairly straightforward - Hotwire and Riot team up and take him down, though the implication is that Riot is the only one actually fighting him - perhaps Hotwire gives him an upgrade that gives him the edge needed to guarantee victory?
(All then will be left to the witch (Opal) and the pure of heart (Charity) to help strengthen the remaining troops of earth to keep it from falling into nothing.)
This also seems super straightforward. There's still resistance from the armies of Earth, but without the aid of Opal and Charity they will crumble.
So basically the forces of evil here look like Miley as the main antagonist, either gaining Ryuu as an ally or killing her, Jenny/Addison (possibly against their will or without their knowledge) Robot Sniper, and Roman as likely some sort of puppet master.
The main heroes are Quiver, Zero (either unintentionally or likely at the last moment), Hotwire, Riot, (All four of these acting either on their own or directly with each other only - as seems the case with Hotwire and Riot), Opal, and Charity (who seem to take on a support role working directly with the humans)
This leaves Ryuu as a wildcard who will be part of sparking the apocalypse and Leon as a completely unknown wildcard.