HAHAHAHAHAHAHA.

Okay, Mukuro is more likely to sideways dodge; the main things he hides have to do with having affiliations within the house anymore, at least. Of course, he's subject to Spade's firefly, and Spade's safe, I think?

Giotto (passed_torch) is another one where whether he's hiding things or not depends on how he takes to Callo; a lot of his background he's not likely to more than gloss over rather than hide.
HOWEVER HE'S ALSO LIKELY TO LIE LIKE A RUG ABOUT HAVING TIES WITHIN THE HOUSE AND I'M SURE HER SEEING HIS FIRST CHAT WITH THE ARCHITECT WOULD BE KIND OF HILARIOUS.

Soma (eternal_night_ends) is LOUSY at keeping secrets. He'll probably sanity-dodge the "I'm Matthias" off and on though he's getting better about it, and he'll probably be dodgy about having gotten behind the clock/his ties to Miss.

Kuja (silver_lucifer) will avoid/dodge/lie about being one of Lyhn's students, will introduce himself as nothing more than a merchant/artificer, will use the fact that he's working as a healer here as a dodge, etc., etc., it'll be hilarious.

Saguru... doesn't have much to lie about though he might dodge the agreement with the Phantasms.

David is probably going to face-first any time he gives any indication that he's just an empathic human or is the age he looks or is -actually- helpless and not just functionally helpless etc. etc. etc..