Foil: To Ma'ar. Both are Person of Mass Destruction and leaders of their respective armies and are scientists (Uthro made gryphons, Ma'ar created makaar) and powerful mages. However, Ma'ar seeks power and control while Uthro wants peace and is a Reluctant Ruler. Urthro shelters the very people Ma'ar is trying to eradicate.
High-Class Call Girl: Unfortunately mistaken for one, to his frustration. He is a kestra'chern, a profession that entails being counselor, confessor, emotional support, entertainer, and mediator, anything that can contribute to the emotional and mental well-being of others. They're rather similar to the Companions on Firefly, though less religious in nature. It's implied that he has sex with a client, a young female soldier, after he gives her a rather brutal sports massage to realign her spine after she was thrown from her horse (she didn't want to go to the Healers because she didn't want to waste their resources on fixing her when there were those who were far worse injured). The unfortunate confusion between kestra'chern and camp prostitutes leads to several unfortunate though somewhat funny incidents.
A young Healer makes the mistake of calling him a prostitute in a public mess hall. Amberdrake cuts the Healer completely down in public, without raising his voice at all.
A very confused, very sexually frustrated Zhaneel, overhearing the above soldier client and misled by some innocent remarks from Skandranon, tackles Amberdrake during her first appointment with him, asking if he was going to... service her (the appointment technically was for a grooming and primping session, after which female gryphons usually go to meet an intended partner). It goes from bawdy comedy to tragedy pretty quickly though, as Amberdrake yells rather thoughtlessly, "I can't!" meaning the size and species differences but inadvertently triggering an emotional meltdown from Zhaneel, who suffered from suicidal ideation from her crippling self-hatred. Thankfully, Amberdrake is able to calm her down sometime later.
Disability Superpower: Kechara is perhaps the most powerful telepath we encounter in the Velgarth universe, but it's implied (and outright discussed in The Silver Gryphon) that her power comes at the expense of her developmental disabilites.
Meaningful Name: Kechara means "beloved". Her name lets Skandranon know that while Urtho kept her in a tower, he still cares for her.
Mutant: She's one of the unexpected results of the gryphon breeding program.
Never Grew Up: She's chronologically the same age as Skandranon, but physically and mentally stuck in a childish state.
Failed a Spot Check: When he considers marrying Winterhart and she starts showing reluctance to pursuing the later stages of courtship, it takes him a while to make a link between this and the glaringly obvious fact that she has a young child fathered by Amberdrake and the child in question has come to the palace with her parents.
High-Class Call Girl: Technically a kestra'chern, a profession that entails being counselor, confessor, emotional support, entertainer, and mediator, anything that can contribute to the emotional and mental well-being of others. As part of being a provider of comfort and support, kestra'chern can provide sensual and sexual services, most being trained in massage, beauty treatments, and sexual acts. They're rather similar to the Companions on Firefly. When traveling with her household, including a disguised Amberdrake, she has to use every bit of her training to get through checkpoints when bribery or bluffing doesn't work. Slightly averted because she ends up in southern empire, where kestra'chern are revered and well-respected members of society and not conflated with sex workers.
I Want My Beloved to Be Happy: Desperately in love with her primary "client," Shalaman, though they cannot be together because of the strict social hierarchy, and very nearly has a breakdown when Shalaman proposes to Winterhart, though she doesn't hate Winterhart for attracting the attention of her beloved.
Lady of War: Beautiful, composed, sword skills and able to lead a group of refugees through a war.
Four-Star Badass: A respectably ranked officer in Urtho's army who keeps getting promoted higher and higher - in part from her intelligence, courage, and leadership but also in part because a horrifying war of attrition is eating away at Urtho's army despite his best efforts. By the time White Gryphon comes around, she then makes quite a respectable shift as a civilian leader too, organizing infrastructure and starting a police force.