Ratu's entire presence as a schemer hinges on those rivalries. It's not just a background feature; it's the engine. The plot moves because Ratu identifies a rival, assesses their power base—maybe it's another noble house coveting the same trade route, or a court mage who sees them as an upstart—and then meticulously works to undermine them. Their methods aren't always brute force; it's often social maneuvering, planting seeds of doubt, or turning the rival's own allies against them. Each successful move against a rival grants Ratu more influence, which draws the attention of an even bigger, more dangerous rival. That escalation is the plot's backbone.
What I find particularly compelling is how the rivals aren't just obstacles. They're reflections. The cold, calculating archmage rival highlights Ratu's own strategic mind, forcing them to be even sharper. The hot-headed warrior rival throws their calm demeanor into relief, but also tempts them into more direct, risky confrontations. Beating a rival isn't just about winning a fight; it's about proving a point about their own philosophy of power. The story would just be a sequence of power-ups without those personal, ideological clashes giving each conflict weight.
Honestly, the moment where a former rival becomes a reluctant ally—out of mutual necessity against a common, greater threat—is a trope I live for, and this narrative does it exceptionally well. It shows the plot isn't static; the alliances shift because the rivalries are so deeply personal and context-dependent.