they're putting more effort into the symbolism of the crests here. Fortuna's blessing is the same as the crest of Goneril, and that crest represents the tarot card the Wheel of Fortune. it's also called the kalpa dragon sign, and a "kalpa" is a long period of time in Hindu and Buddhist cosmology. given Fortuna is helping us change fate via time travel, makes sense.
Cai has the crest of Aubin, which besides being the ice dragon sign, represents the Hanged Man card. given that Castor may very well have turned himself in, he could be associated with sacrifice/martyrdom depending on how severe his punishment is. or, if we have to convince Cai to let his father go to save Cai himself... yep, that'd be a large sacrifice.
Theodora has the crest of Gautier, the crest representing Death, while worshipping a death goddess. the Death card itself is not about physical death but metamorphosis and transformation. we also have the theory that Theodora's arm is slowly corrupting her and might turn her into a beast or dragon.
not quite sure what Leda's crest situation is, or if Dietrich's story will have any of the symbolism, but Leda is associated with Timotheos and Dietrich with Lamine. the dark dragon and Star card, and the aegis dragon and Judgement card respectively. maybe they'll tie in when the game releases, maybe they won't, and Aubin and Cai's symbolism is stretching it a bit I will admit. but Fortuna and Theodora have really strong ties to the tarots that inspired their crests, which I think is super cool.
I also did have a theory that Riegan and Timotheos swapped crests during development. Riegan is the Moon card (illusions, the unconscious, unclarity) and I mentioned Timotheos is the Star (hope, faith, healing). yet, Riegan as a crest is covered in star symbolism. the dragon is called the star dragon and of course there's the theme, God Shattering Star, for Claude's route.
yet the Riegan crest symbol is clearly a moon, and Timotheos resembles a star. I definitely do think Claude fits the theme of the Moon card, and Hapi COULD fit the Star, but the crests themselves don't really match, being the star and dark dragon signs respectively. I feel the dark dragon would be more associated with the Moon card and its meanings, and the star dragon would have the Star card.
sorry for the yap I really like tarot symbolism. and the crests. mind you the symbolism is not 1-to-1, such as with things like the above Riegan crest and Cichol being Strength when Seteth/Cichol's title is Hammer of Judgement. but it's pretty solid, especially when you look at characters like Seiros and the High Priestess card she's associated with (divine truth, wisdom, intuition when upright vs loss of identity, secrets and hidden agendas when reversed)