Habutheri

Also, if one House can have numbers so high, then all can, but none of that will matter if the MC doesn't have a Dragon.

He might even pull a Hisoka.

Technically, you graduated with Neji, Tenten, and Rock Lee. The MC still has a few months from Naruto becoming a Genin until the Chunin Exams, where, if I remember correctly, the MC needs an intructor's nomination to even participate. Despite this, he's not obligated to participate alongside Naruto. I really hope this isn't one of those fanfics where the MC is a parasite and follows Naruto around.

Yeah, and besides, doesn't he need a team captain? Like a Chunin instructor?

Why exaggerate the numbers? 50k is the same number to what the Westerlands can raise and I'm talking about man at arms. 10k-15k should be the correct number that House Blackwood can raise, maybe even 20k with forced recruitment.

I can imagine he jumping down from Olympus

Zeus did what...?!

Nature and Destruction = Natural Disasters. Maybe he can share with Poseidon.

Shouldn't he have a new epithet for the domain of Destruction? Something like Kataklysmos, Aphanismos, Olethros or Ereipiopoios. Btw, all major greek gods have more than one epithet.