However, I still think such character count in a game is IMPOSSIBLE. This means you would have to come up with their mechanics, designs for each character. One by one. The mechanics part can be simplified like they do with Slendytubbies, no mechanics at all. Run and hide away from them.

An acceptable count in a game of this size, can be about 30ish. Five playable characters I can accept, I guess.

2.

NO.

3.

Call me crazy, but I think the amount of gamemodes and content this game is going to have sounds very ambitious. Especially for such a small team, which I assume is... one person. The Return to Freddy's 5 did this with their modes and all, look how it ended up. (assuming the amount of content was the reason why)

Overall, this sounds like that RAW - Open World MMORP Game scam from Kickstarter from a couple of years ago. Sounds too much ambitious for such a small team, since GTA 5 Online is very BIG.