In Dragon Keeper Chronicles, Regidor is an example of this, mixed with Lightning Bruiser and One Hero, Hold the Weaksauce. Most wizards have one power, say Light Magic, Sound Magic, or Swamp Magic. Evidence from carvings in some sea caves under the Inner Sea suggests that the merfolk, locathah, and sahuagin inhabit the deeps and have battled each other since this time. -18800. Establishment of the first elvish settlements of Miyeritar (Present Day: High Moor, Misty Forest by green and dark elves due to political differences with the gold elves. He's about twenty years older than his students, so he's had time to study, and it's all basically Rule Magic anyways. In The Gods Are Bastards, Elven headhunters can use any of the four kinds of magic at will, utterly wrecking the system of relative advantages and disadvantages and rendering them nigh-unstoppable. On the other hand, the so-called Grey Jedi ( Kyle Katarn is a good example) fit the trope better, rejecting the completely emotionless philosophy of the Jedi while avoiding the It's All About Me philosophy of the Sith. Ilythiir now directly skirmishes with the major realm of Keltormir along its eastern and southern expanses. With another major migration into the Sea of Fallen Stars after the fall of Thearnytaar, the sea elves expand militarily beyond the Selmal Basin and establish the undersea kingdoms and regions of Coranthys, Tor Meraliir, Ullythan Reef, and Ryen.
Star Wars Legends gives us Jacen Solo, who thinks he can become this. It is totally subverted, as by the end of Legacy of the Force, it's fairly obvious Dark Is Evil.