Necromancer have summon ally and heal, it easy on starting.
only Flying type character reach unique character spawn spot,
so Birdman Tribe Leader and Wind Dragon are best.
if you cleared boss' lair,+1 Unlocks available and restart with unlocked character.
 "Heroes of Gaia"){kind=icon}
 "Jacksmith"){kind=icon}
 "Tyrant"){kind=icon}
 "Dawn of the Dragons"){kind=icon}
 "Great Dungeon in the Sky"){kind=icon}