Sera headcanons - Thunderstorm fear
Sera isn't too keen on admitting this one without being caught in or around one, and firmly believes it to be a childish fear to have. However, it's born from her teen years; while camping out, as per her norm, an overnight storm forced her into a tree for protection against the elements. When the thunder and lightning began, a nearby traveler had the came idea and climbed a tree not far from her own... But he wasn't so lucky. Sera watched lightning strike him and his tree, killing him before setting the small forest ablaze and forcing her to run for her life.
Ever since, she'd been convinced a storm is going to destroy or kill someone near her, though she truly and honestly does know better, though it doesn't stop her from seeing it happen in her mind. As a result, it manifests in one of several ways during a storm: If alone, she'll curl up in a corner and scream, crawl under the bed to hide, even wrap herself up in a loved one's clothes (i.e. Sin's robes, Yato's jacket, etc) if there's something nearby for comfort, and remain as such until it passes.
If with a friend (Yukine, Sharrkan, etc), she'll curl up with them and panic, wanting them to be safe and to protect them, but being unable to move.
And if with a loved one(/lover; Sin, Yato-) she'll go all out, wanting nothing more than to be as close as possible to them, and being unable to achieve quite the level she needs. She'll even go so far as to crawl underneath their clothing to find that closeness, and won't calm down until they've successfully distracted her, be it by physical means or simply letting her listen to their heartbeat to drown out the storm.
Whatever happens during, afterwards she's thoroughly embarrassed, and tries to brush it off like nothing happened. So far, only one has made any progress in helping her conquer her fear (Sin)... And there's still a long ways to go.