>Both Cerydra and Hysilens never appeared in the story, only mentioned in in-game texts
>Cerydra gets way more arts than Hysilens
It's her appearance, isn't it?
Hysilens looks like countless other characters and has no unique defining traits.
There are also countless other characters who look similar to Cerydra but unlike Hysilens, you can never go wrong with white hair and blue eyes.
People love blue women.
People love white hair.