For the situation where a character has a "true form" that requires something to maintain, it's up to you as a player whether they remain in that true form at all times or whether they retain the ability to transform from that shape to whatever other shape they attain when they're not properly hydrated. As long as the thing that triggers the transformation is something that could exist in TFS (so, in other words, not a world-specific magic power or object which would need to be regained) it's fine if the character can still transform as a shinki.
For the situation where a character has a condition that would leave them unconscious most of the time, that condition would be alleviated for them as a shinki. As for whether this affects their physical appearance as well, that's up to you!
no subject
For the situation where a character has a "true form" that requires something to maintain, it's up to you as a player whether they remain in that true form at all times or whether they retain the ability to transform from that shape to whatever other shape they attain when they're not properly hydrated. As long as the thing that triggers the transformation is something that could exist in TFS (so, in other words, not a world-specific magic power or object which would need to be regained) it's fine if the character can still transform as a shinki.
For the situation where a character has a condition that would leave them unconscious most of the time, that condition would be alleviated for them as a shinki. As for whether this affects their physical appearance as well, that's up to you!