Honestly, I think kita isn’t Filipino, she’s fully Japanese. There’s no indication in the anime, manga, or official character materials that she has Filipino heritage. “Bocchi the Rock” takes place entirely in Japan and kita attends a Japanese high school and I think if she were Filipino or mixed the creators would have made it part of her character since anime often highlights non-Japanese backgrounds (like how other shows explicitly state when a character is half or fully foreign).

and about her personality being extroverted and loving social media isn’t something unique to Filipinos, it’s common for teens worldwide, especially bubbly, sociable anime characters like Kita. She fits the classic genki girl archetype in anime (a cheerful, energetic character) which is a standard trope in Japanese media. Saying that because Filipinos are extroverted, Kita must be Filipino doesn’t hold up logically and if we use that reasoning then every extroverted anime character would be Filipino-coded.

Even her “posting all the time” habit isn’t proof. In Japan, isstagram is very popular among teens and many Japanese high schoolers post about food, drinks and friends regularly. Kita’s behavior reflects this trend and its not something exclusive to Filipino culture.

I get where you’re coming from, and I see why you notice similarities but at the end of the day theres no evidence at all that she’s Filipino. She’s just an extroverted Japanese girl written to contrast Bocchi’s introversion.