Not sure if coincidence or there is an increased chance for getting the rare character that you desire..but I've gotten these from Rare Soul:

Corrupt Commander on Magus Lord Of Light Day
Gunner Golden Son on Gunner Lord Of Light Day
Assassin Golden Son on Assassin Lord of Light Day
Warrior Bomber Boy on Warrior Lord Of Light Day
Assassin Undead Axis Soldier on Assassin Lord of Light Day

Anyone with similar observation?