There are four for Kraken! Like the Cerberus pieces, they're scattered around, though that bright sea green is probably easier to spot than the warm purple.

A bubble tea charm, with the Archer symbol on one of the little boba.

A figurine of a phoenix in flight, wings open, with a Lancer symbol hidden in the flames.

An uncustomized ball-jointed doll, on a display stand, with a handful of different outfits in its arms. The Assassin symbol is stitched onto one of the outfits.

A little jar of fireflies, with the Caster symbol carved into the lid.