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Regarding the bonuses. How did Agar transform from a Lich into an Undead creature?
New here? I'm Roha — want a quick tour?
Regarding the placement. It can be positioned slightly to the right of the LEFT hero; it will cover a bit of the landscape, but I don't think that's a big deal.

Was he a Lich?
No need. And I can tell you why. It seems they wanted to make a mod that is as close as possible to the original Heroes of Might and Magic III :)
And would there even be enough space for it?
And a question. Will there be a second branch of creatures in the beta version?