Here are my ideas on how to implement some of the bigger Monsters and characters from Time of Legends: Joan of Arc into Mythic Battles: Pantheon.
As mentioned by other people. It could be possible to implement the Gryphon and the Beast as alternate sculpts for...well the Gryphon and Typhon respectively.
Maybe you could also swap Lycan with the werewolf, but then he would probably be a bit small (Maybe if you got a lot of big minis, the safe some space o the board?).
Here is just the size I am assuming the different units to have.
Dragon, Devil, Beast: Bigger than a Titan
Leviathan: Around the hight of a Titan
Gog, Magog, Great Reaper: Around the size of a God
Antichrist seems quite big on the rock, but actual mini seems to fit into the 32 mill scale.
The four horsemen and the archangels seem to be possible to be played as heroes or monsters.
(Overall most of the "main" characters in the Apocalypse seem to a possible hero unit, but I am not sure about that. After a better comparison I can calculate that better.)
Death (horsemen):
Low Attack but high Def with only a range of 0, but move 2
Talents: Torment, Sneak Attack
Three activation cards and one AoW card.
Power:
Upside Down:
At the beginning of combat, Death can choose if all attack and defense values in this fight are switched (Maybe till the beginning of your next round if you spent an AoW on it).
More will follow later. If you are interested or just want to state your opinion feel free to write it down!