Our best yet look at Assassin in Fate/Samurai Remnant, from a short clip showing off Musashi's pre-order costume.
I still fully believe he's Koga Saburo, Chiyome from FGO's ancestor and the reason her family is cursed with Orochi's powers. Those are snakes wrapped around his arms, and he was standing on top of Orochi in a previous trailer.
I'm surprised that you still call Chiyome "Paradiso" even tho FGO got rid of that EOR's hidden names thing back in 2020
what can i say, I like the name. Paraiso just feels fitting - same goes for Inferno but Tomoe wins out because Persona has conditioned me to get dopamine from that name.
But yeah, i mean as far as Paraiso goes, heck I have an entire AU that makes Dante Alighieri himself a mainstay EOR onward ally a la Sherlock. It's just a shame you can only set the fcking not even subtitled battle voice lines to be pre-revelation, and not the actual display name and such.
The hidden true names were terribly implemented but honestly they had a ton of potential for extra flavor and such, and in the case of Tomoe + Columbus + Doppleganger + Moriarty it explicitly made the character so much better.