Daigo
Medallion Trigger: N - Not a single drop of magic.
Scent: Cigarette smoke, cologne, soap, pomade, otherwise normal human dude smell.
Pulse Detected: Is an exceptionally composed liar.
Gait/Breathing: He's just a dude, he has no stealth modifiers.
Axii: N - He can make his savings throw for will.

Creeping Dust
Medallion Trigger: Y
Scent: Blood. Incense. Nothing when he's incorporeal.
Pulse Detected: His corporeal form has a pulse (distant and dampened sounding).
Gait/Breathing: His corporeal form breathes/etc, he can shed his corporeal form and transition fully to a liminal space off his current major physical plane.
Axii: N - And he would be shitty about the attempt.

V
Medallion Trigger: Y
Scent: Library smells. Ink. Paper. Oil lanterns and candles. Alchemical ingredients. Autumn.
Pulse Detected: Is a particularly composed liar.
Gait/Breathing: He can shapeshift. He can be a guy with two legs, he can be a giant spidertaur with eight legs, or he can be a literal shadow (which does not make any noise).
Axii: N - And he would be shitty about the attempt

Lady Ilde
Medallion Trigger: Y
Scent: Perfume, flowers, smoke, fire.
Pulse Detected: She's irrational, so I would say her pulse is an unreliable narrator. Not always wrong, but often ???
Gait/Breathing: She does have a stealth modifier, but I think he'd still catch on to her.
Axii: Maybe??????