Mortals Meet Demigods (Mist and no Mist)

Questions! If you answer Ill write another chapter

hey everyone! I know i've been gone for a really long time now but i was pretty busy over the summer and then school started so i haven't had much time. not only that, but i also just don't know what to write
like it says in the title, help me with this and i'll try my best to make another one shot for here!

just now, i saw this book i started in my drafts, and i just finished the second chapter. it's about nico going to hogwarts. i'll come here for questions i have if y'all are willing to answer

1) What house should Nico be in? I think he's a Gryffindor but he might also be Slytherin (even if it's just for the aesthetic idk)

2)Should Harry be an arrogant jerk or not? I've seen ones where Harry's super arrogant and stuff and it seems fun to write but i also think Nico and the trio could be great friends

3) Should Nico befriend Draco? I'm not too sure about this one but i really like fanon (not canon) Draco Malfoy so i kinda want to write them being friends but idk

4) If I do have Nico befriend both draco and the trio then who should be that mean person(s) that kinda gets in the way of nico's mission?

5)My original plan was to have Nico go first and some other demigods join him later, but i don't know if i still want to do that. It could be an interesting idea but i'm not sure

that's all for now and hopefully this doesn't spoil too much. i just love reading nico goes to hogwarts fics and decided i wanted to write my own like, a year ago. i never finished but i kinda want to now bc since i've run out of ones to read, why not have one to write?

*this story isn't published yet, i'm trying to build up chapters so you don't have to wait too long to get into it. this book will have swearing/curses*