The favorite, Metatron...
Special appearance, interesting almighty skills,
His Fire of Sinai in Nocturne is just marvelous~
Maybe sounds ridiculous,
but it is Metatron that draw me to SMT series games
And also Beelzebub, Vishnu, Shiva and Gabriel in Nocturne;
the Norse Níðhöggr in Digital Devil Saga 1;
Gnostic deity Abraxas and Babylonian goddess Ishtar in Devil Summoner.