They all have more personality than Byleth.
Doesn't even need to be a BotW character, could have been Impa from Skyward Sword, Vaati or someone else.
And? Byleth is the reason why one of the Lords don't go nutty, while the champions did nothing but die.
I don't mind Impa, and have in fact said she should replaced Shiek who is a relic. And no thanks to Vaati.