Nah, I'm just trying to get 100% event completion. Not to farm all the bazaar goodies. Farming in legendary is a luxury for me at the moment XDHmm Sera Kensei is decent, but the main thing Sera Rogue has over Sera Kensei is her aura (trigger her attack again) and when paired with another Sera Rogue (friend or stranger) or even more trigger units it makes farming the Legendary event very easy. Also afaik Sera Kensei's aura buff is based on her crit before the event buff sadly.
If you're all about just clearing it for the first time any Sera will work don't worry. xD Farming may be difficult as you might not be able to kill the last 2 chests.
Glad to hear my kensei sera still have hope.