Crazy Ass Moments In Megaten Historyさんのイラストまとめ

Odin's peculiar new design in SMT 4A is in part a consequence of the MCU, which depicts Thor and the other Norse mythological figures as an advanced alien race.
Inspired by this Doi based Odin of on Ultraman, who has very similar origins to that of the MCU Norse deities. (2016)

Cerberus is eternally stuck being depicted as white lion with a snake tale within Megaten, the design being and homage to his appearance in the original digital devil story novel.

There's also his Soul Hackers design but we don't talk about that.

The filler character "Cut N' Paste" from Konjiki no Gasshu!!(known as Zatch Bell! in English) has a somewhat strong resemblance to Orpheus from Persona 3. Cut N' Paste only appears in the anime's 31st episode. It aired in November 2003, the same year Persona 3 began development.

Instead of using his traditional fly design inspired by his appearance in the dictionnaire infernal, Beelzebub in majin tensei 2 has a new design which has never been used again. (1995)

Kerberos' original design from the first Digital Devil Story Megami Tensei novel