These two were originally planned to play a much larger role in the story – Shadine being one of Ishar’s predecessors, and Shinade being Ishar’s current official second in command (unofficially it’s Skybold).  Thing is, though, neither of them really leaves the Sanctuary at all – Shinade mostly handles finances, and Shadine’s always there to keep everyone’s training up.  It just didn’t make any sense, and they eventually faded out of the spotlight.  They’ve still got a few appearances, but they’ve got a lot more backstory than I’d usually have for such minor characters.