Honestly, Sara just screams chaos and pointless so far. Tho, it might had a positive impact leading Tsubosaki to receive help from Kazuki and reaching the friends lvl with her which made her realize she wants more than that. Guess, Sara is also pretty cute when quiet, but thats all. She might develop more but i couldnt care less tbh.
Is already hard for me sometimes to deal with the extreme tsundere types that can often be more annoying than cute but adding a loud character to the mix is too much.
An Iwao is the prefect side character for my yuris. Always has a good vibes, doesnt affect the story in negatives ways, possibly can be a wingman and is essentially a wholesome existence. Add to that the fact he looks like a cute girl and is just amazing lol