I put Orianna as the Councilor because, frankly, she's the only one who could realistically give advice to Mags or Skapti and not be roundly ignored. Plus, there was a priest back at Oleg's whose name escapes me, but Mags will draft him to be the High Priest.
On Rulership- Skapti makes the most sense from a Public Relations standpoint, and I envision Mags are more of a "running the kingdom from behind the throne" sort of guy. People like following beer-drinking, whoring, jousting, fighting, more drinking, warriors. It's better than beer-drinking, whoring, more drinking, magicking, wizards. Nobody wants to live under a Wizard King. Everybody wants to live under a Warrior King. However, no one wants the Warrior King to make the rules, they just want him to be like a warrior. They expect his advisors to run things. That's what I'm envisioning this realm having. Skapti sits on the throne and makes random edicts and proclamations, while HSM translates Skapti into Common and everyone goes home happy.