oho lemme think. c6 im not sure. i got the only one i reaaaally wanted (neuv) so idk who else would be cool to have. among my top favs (that arent 4*s) zhongli has dogshit cons, alhaitham has dogshit cons though less shit than zhongli's, hu tao's are fine but nothing too exciting esp in this day and age, same for ayato.. it's probably between furina and scara? furina c6 is busted but then i'd feel like im cheating bc shes a support so she would make 70% of my teams busted too and then i feel like it would be too much lol scara c6 looks fun but it's not worth spending all those pulls cause he's mid but if it fell into my lap for free........... also simp reasons

as for e6.. well he's not out yet but probably screwllum LOL or the five star sampo that definitely exists. i dont really care for eidolons in hsr bc it's just more damage in most cases since it's a turn based game so idk. i'd say jing yuan for simp reasons but his eidolons are mid (just like him fr). meanwhile screwllum is p much guaranteed to at least have good ones since he'd be new. maybe i'd pick boothill bc it gives him aoe coverage ..