When the author references a character he often makes note of a defining characteristic.I've seen complaints about this, actually, that it's annoying. Me, I found it lazy, because it wouldn't be necessary if everybody's interior monologues weren't written in the same damn voice.
I mean, I should've peaced-out of Wheel of Time after Lord of Chaos because I knew he wasn't going to beat "Kneel before the Dragon Reborn, or you shall be knelt" unless he killed Faile painfully which was never going to happen and half-heartedly read maybe two more before going okay, Egwene, how fucking long are you going to camp the White Tower without attacking, plus I hate everything that is happening to mah boo Mat, so I was seriously done then. But you know what? As irritating as all that braid-yanking and skirt-rearranging was, I had no problem keeping up with all those characters. Clumsy, but effective. Perrin's interior monologue? Dumb as a sack of hair, so distinguishable from Mat, whose thoughts were quicker, and from Rand, with his moping and whinging.