Are you specifically asking for Battlegrounds??
Wiccan will be helpful in BG, defense because armor break immu and incinerationIn attack by ending combo with L attack so u neutralize and they don't gain any armor upOtherwise globally good champ but would be too long to explain full kit i recommend u to check out a full vid about himTitania not so good this BG metaLess long to explain but im not feeling like explaining sorry (there are also nice vids on ytb)Sersi idk since I'm not playing her, waiting for the dupe