i am usually more attached to some characters than their series as a whole, except for the ones in the animanga/games lists which i love as series too. (after the & = ship involving said character)

• chocola meilleure - sugar sugar rune
• all the girls from little witch academia & diakko
• saijou claudine & mayakuro - revue starlight
• kei yonagi & chiyokei - act-age
• hau, N, team skull, team rocket, lillie, acerola, roxie & jellowshipping - pokémon
• akemi homura & madohomu - puella magi madoka magica
• midori tokiwa & midotama - tamako market/love story
• arisa ichigaya & kasuari - bandori
• yuu nishinoya - haikyuu
• shinobu kochou - demon slayer
• rei hino - sailor moon
• maki katsuragi - hoshiai no sora
• nico yazawa - love live
• ponyo, kiki, shizuku - ghibli
• naoto shirogane - persona 4 (hate the game itself though)
• yuffie kisaragi - final fantasy VII

also more on https://anilist.co/user/sunwoo/favorites