Phantom Thief B's Identity *spoilers*

[Iido]

So I just did the Phantom Thief B side story in chapter 6...Am I correct in assuming that Tragic Artist Y is his identity?

He said "My number reveals all". B is not a number, but it is the 2nd letter of the alphabet...and Tragic Artist Y was theory 2. (and also the 2nd from last letter in the alphabet...)

This seems way too simple to be the answer, but maybe it actually is?

[Kommando Nob]

Remember he's Enforcer number X.

[Iridium]

The game also directly confirms which of the three identities is his during a later door, although it's not guaranteed that this bit of information is one that will show up.

It's X.

[That's ich!]

He is Enforcer Number?

Also, as Iridium said, a door later confirms who he is.

[Iido]

DOH, had a huge brainfart. I legit forgot he was an enforcer haha XD; Well, that certainly explains it.

Uh, in other news I just reached the third area of plane 6. Great to hear this music again! Looks like we're finally gonna get to fully explore Leiston Fortress!

[Coffee Dance]

It's X; in Sun Door 5's minigame, it appears as a question, and X is the right answer (I found out through a lucky guess)

[Shylaar]

Spoilers, dude. Not everyone who's played Sky has also played Cold Steel.