Need Some Help Making New NPCs For My IRL Campaign

[KoolKobold]

So, my IRL players will begin Hook Mountain Massacre Sunday, and while these NPCs won’t be battled with until then, I do need some help as they are important.

Starting with

Esku the Traitor:

In my campaign, there is a gigantic clan of kobolds that are neutral or good that live in 3 connected tribes with Sandpoint, Magnimar and Turtleback Ferry. The latter tribe is in close connections with the Order of the Black Arrows, and one of the allies of the giant hunters is a kobold who lives in the Wyvern Mountains-a kobold druid by the name of Esku.

While Esku has served a sentry well with her wyvern friends, she has grown bored as of late; when Barl and Lucrecia tell her of plans to make Varisia a paradise for giants, and a reward for her ruling the mountains and the lands around it as her kingdom for wyverns, she gladly accepted. She helped the Kreegs sneak into the Fort, where she attacked with some of her wyverns. When the wyvern she rode fell, she channeled all her magic into the creature to try and save it-the end result was not what she expected. The wyvern did live, but she unexpectedly transferred her own soul into the wyvern’s body. Although confused for a second, she grew even more determined than ever to be the Wyvern Queen-and now she is helping Barl build an army of fiendish wyverns for Mokmurian.

Creature: Unique wyvern of some kind. Was thinking advanced with the druid simple class, or, barring that, a wyvern with some class levels in draconic shaman druid, or something similar. She is meant to replace Grazuul, so she’s a CR 10 encounter. The trolls who worship him are gonna be replaced with a CR 9 hydra.

Sophia Arkonei:

This NPC is heavily tied in with our investigator’s backstory-and she will be an enemy encountered in the Library of Thassilon in Book 4. The backstory here is, after getting a tip about activity regarding Thassilon in Varisia, the history fanatic left to inspect, where she discovered Lucrecia in Turtleback Ferry. After a talk with the mysterious woman, Sophia was told to meet with Lucrecia’s sister, Xanesha, in Magnimar, for directions to their “Lord”, who will judge if she is a worthy candidate for Mokmurian’s army. Sure enough, when presented to the stone giant wizard and displaying her knowledge and interest in the Kingdom of Greed, Mokmurian told her that they plan to rebuild Thassilon on top of Varisia-and in her blind faith in Thassilon’s greatness, she agreed to be an ally.

She will fight with two clockwork soldiers. As for her race and class, human that multiclasses as bard (detective) and gunslinger (mysterious stranger). Idea is that she buffs the soldiers as she attacks from a distance (and even if her bardic inspirations wouldn’t normally work on the clockworks, I would give her an ability called Thassilonic Inspiration that allows her bardic inspirations to work on the soldiers.

I’m good in general with making stats, but I would love some input into good ways to make these encounters challenging yet fun.

[KoolKobold]

…So I just remembered wyvarans exist. Though idk how that could be possible for a kobold to turn into one to save her wyvern.