kokichi's and korekiyo's tropes! for the nsfw ones go here...
kichi kiyo both 
childish older sibling, cool big sis, mature younger sibling, brother-sister incest + forbidden love, clingy jealous girl, crazy jealous guy, implied love interest (during V3), the lost lenore, one true love, satellite love interest (pre V3), yandere couple, bite of affection, divine date, fate drives us together, father, i want to marry my brother, holding hands, love is like religion, love makes you saner, love makes you crazy(er), loving details, mutual pining (no more!), obsessive love letter, our love is different, outlaw couple in TCOAAL, perverse sexual lust, picky about validation, reincarnation romance (in V3), siblings ying-yang, introvert-extrovert pairing, savvy guy, energetic girl, single-target sexuality, true love is a kink 