>>536441751) She suppresses her natural lisp which creates an incredibly terse, unnatural way of speaking.
2) She's always 50 seconds from breakdown which makes her *ooze* disquiet
3) She's a staunch ride-or-die believer in JP-style high strung performative vtubing and as such utterly embraces het role as a horror creature
The parts of her persona that are put on are designed to fit in seamlessly with the ones that reflects her natural traits.
She's deliberately eerie because she knows she's got naturally eerie traits/habits and thus leans into them basically.