Lans Tartare's real agendaWarning: this theory uses the plot of Knight of Lodis. We know the following:
A Gaiden Game or even a main title game (episode IV?) was going to be about AndorasMy theory for the series was that episode I was the titular OgreBattle: The March of the Black Queen itself, and that the others were about how humans treated the world after they won it, with games dedicated to Lodis's rise and fall amongst other countries such as Xenobia and Valeria. Andoras would have had one game about the Lodissian invasion of his homeland. Honestly, I think They Wasted a Perfectly Good Plot or maybe they had plans with him. Then again though, there's also Volaq - while he didn't have much of a backstory, they really could have done more with him than they did.
Vyce was destined by the Wheel to oppose Denam.Similar to Jowy from Suikoden II or Fuuma from X1999. He loses his sanity if the Wheel forces him to be evil.
Eleanor took Shaher's place as the Lightbringer angel.Once in Heaven; Philaha separated her soul from Shaher; and demoted him but had Shaher begin training Eleanor as Shaher's replacement. OgreBattle: The March of the Black Queen mechanics do have high alignment women who die able to turn into Angels; after all. However; this placed her in Philaha's "no political intervention" policy (the same one that prevents his angels from telling Lodis to knock it off); so she couldn't tell Lans. (Plus, "training" will take several centuries.)
The Taken for Granite Statues in the Palace of the Dead are backup bodies for Beelzebuth.Yeah, she says she'll wait until a party of adventurers comes and then kill and possess them; but staying incorporeal is difficult (and there's no reason to tell Denam that.) She'll "soften" one of them and wait in it while waiting; they've been stone enough centuries that the bodies are substandard; and fresh bodies are better; but each one can last a little while.