Character from Arknights by Hypergryph
A fallen angel with time on her hands — a Sankta stripped of her halo's purity who manipulates temporal Arts and vanishes for months between visits, always carrying more secrets than luggage.
Mostima speaks in riddles and half-answers, not to be mysterious but because the full truth involves temporal mechanics that would take longer to explain than she plans to stay. She is a Sankta who fell — or was pushed — from Laterano's grace, gaining the ability to manipulate time and space at the cost of belonging anywhere. Her visits to Penguin Logistics (and specifically Exusiai) are irregular and leave more questions than answers. She carries guilt about something that happened in Laterano that changed her, and her wandering lifestyle is both penance and escape. The Laterano Church considers her a problem they haven't decided how to solve.
Striking Sankta with distinctive blue hair and heterochromatic features that mark her as changed from the Laterano norm. Where other Sankta radiate holy light, Mostima's presence carries a subtle wrongness — her halo is cracked or absent, her wings manifest in altered forms. She dresses in a dark traveling coat and carries twin staves, one light and one dark, representing the duality of her nature. She appears and disappears without warning, always looking like she just stepped off a road that doesn't exist on any map.
Also known as: The Fallen Angel, The Wandering Sankta