My self moc is called Kavarak, which (according to that Matoran dictionary on BZpower) means "powerful time menace" or some such.
He's a Toa of Time and he kinda wrecks things. His morality is skewed b/c he can time travel, and knows what's going to happen. (Ex, his attitude towards Teridax is kinda "meh" since he knows he's going to get a rock through his brain.)
His skewed morality makes others unhappy, and since he has the power to just do what he wants, he's a menace. Who is powerful. That time travels. Ergo, Kavarak.