Prideful people can be insecure. If they see someone who is remotely a challenge to them, they’d probably be insecure about it and try to crush them before they can amount to anything. Not necessarily paranoia.
Also, I’m not saying Pridak would have children. I’m saying that if he did, he’d probably have them executed so that no one could challenge him.
@JediTimeLord824 wrote out an origin for the first Toa, but then it was decided that it fit better with this time period. These Toa are Lhikan, Tuyet, Lesovikk, Zaria, Jovan, and Krakua. In my megatopic, under the Toa section, I’ve given both the original Kopaka and Krakua the ancestral sword of Ihu.
What if Krakua is one of Pridak’s relatives (maybe a sibling) and is chosen by Melum to become a Toa to end Pridak’s reign and become the new ruler. He defeats Pridak and banishes his supporters (including close family members, one of them being Kualus’ ancestors).
Due to circumstances, Krakua is unable to assume the mantle of king, and it is passed down to his eldest son.
Before anyone says that Izotor’s relation to Kopaka and Krakua is too coincidental, I’d argue that Melum has a preference when choosing the next Kopaka. Melum is most inclined to choose someone related to (or directly descending from) the original Kopaka. His next choice would be a noble.