I predict: Lord will NOT become a playable character, because that would make them one of the "Heroes". And a Hero is the one thing Lord actively refuses to turn into. They actively work to remain as just Lord: of the Heroes.
Lord repeatedly asserting how they are "nothing", "only an ordinary human", "no one of significance", etc. Should Not be taken as a lack of fortitude. I repeat: and they are NOT being a reliable narrator, so perish any imagination of their "incompetence". THOSE ARE THEIR MANTRA. They are "nothing", as in nothing but a ROLE. A backdrop for the True Heroes to shine on. The enabler of the processes, that are called lives, of each one of them. They want to be the silver screen for the ending credits to rise on each of their Heroes' names, with none to call of their own. They are so quick to reject any allegations of their own heroism, BECAUSE they are in the primest of positions to become a hero otherwise.
But the world will vouch to credit them? Mark my words, Fandom, the narrative shall not allow it. If anything else, Lord themself shall not allow it if and once they are given the choice. This story is about the Heroes, and Lord is, and will remain, of the Heroes: the sign lies in the title