No one currently.
Mori: never has been popular, jab machine, awful numbers, wants to turn hololive into nijisanji
Kiara: has the passion and the work ethic but everything else about her sucks, plus her narcissism is a massive debuff
Ina: has another job, too passive and niche
Promise/Council: lmao
Shiori: a gigantic failure, runt of runts and doesn't give a damn about hololive
Biboo: could be but she's an extremely boring streamer, has no wit or creativity
Nerissa: could be, but too menhera for the responsibility and has no charisma and no market to appeal to
FWMC: probably the best pick since they are extremely safe and move a lot of merch, however they are awful streamers with no fanbase culture and their numbers keep going down and down
Liz: doesn't do shit, wants to destroy hololive
Reora: could be, but she's not a particularly good streamer but ain't too bad either, terribly mild but that's not bad per-se
Gigi: a fucking nijisister, she can be fun but she's definitely not someone you want as the face of your branch, magnet problem
CC: she can't even handle her own projects, useless
All in all, unless a miracle happens HoloEN is fucked.