First, I would make sure that nobody in my close family has to worry about money ever again.

Second, I would calculate how much money I can realistically make during all my work life with jobs similar to my current one, and set a slightly bigger amount aside, so if I decide to work, it's because I find it fulfilling, not for need. Perhaps make periodic transfers to another account to make the illusion of a salary.

Then, set a huge "cushion fund" so I still have reserves in case of an unexpected emergency. Plus enough for retirement age, because there is no way the government will be able to guarantee a decent pension. Invest part of it in very conservative funds to try to at least beat inflation.

Let's assume there's enough money left to start a company! How about a video game developer in my home town, giving jobs to local talent? I would keep a creative role but delegate management in people who actually know what they are doing. And anyway, in this scenario I am so rich the goal of this company is not exactly making money.

If I really really want to burn money, I would start a publishing firm for local scifi/fantasy authors. Perhaps even more genres.

And because I am so filthy rich, let's take frivolity up to eleven and buy the rights to a classic TV show franchise and revive it with a new season.

Yep, I have given this topic a ridiculous amount of thought.

I'd do nothing that resembles having a job... so no producing movies, not working for LEGO, etc.

I think they're called "gold diggers".

You don't really want to know what I'd do.
Let's say I am definitely not greedy, and definitely not generous.

If I was rich, I would live on the farmlands of Japan and enjoy life in relaxation with some radiation to boot.

if i was rich i would build the best pc i can, go to a good collage and get my dream job.
I would also have all the games i want, and almost every console.

If I was rich rich rich, i would...
...bitch bitch bitch, all day long.

I'm poor and I do that now.

Sound like you're a teenager living in the US (the college thing).

Build a corporate giant of my own, with the following goals as part of a deep, infinite, and excessive bucket list:

1 - Purchase the Sherlock estate and Capcom, release all Ace Attorney content without badly done localization.

2 - Create a GOG-esque platform, where the criteria is "good media". Not new, nor old, not popularity-based, just neat stuff. Lobotomy Corporation, Monster Tale, Slayers, Wonder Project J, Patlabor, Snatcher, Lufia II, Yes Minister, Tsukihime, ect.

3 - Conquer the world, ensure transhumanism for all. Natural creatures will be replaced by artificial replacements, such as cyberwolves and robo-trees.

4 - Dyson shell the sun, use that as a springboard to shell the quasar of this galaxy and all others eventually.

5 - Bake some peanut butter cookies for myself.

Might as well dream big, no?

Quit my job, laze around all days and play games and watch anime and stuff. But first I'd hire a trustworthy mercenary force to defend me and loved ones and my riches. And probably donate to charity too.

Build a house out of earth bricks.

ya kinda, i mean i do not need to buy anything to live yet. so why not plan ahead and have fun
I would also invest in stuff

Serious answer: nothing.

What else do I need? I mean, mental health would be nice, but money can't buy that.

So, I'm cool. Anything I really need and or want is either free or very affordable. Easy sailing.

1. Pay off all debt/bills for all of my family members and friends

2. Donate most of the money to charity

3. Keep a little for myself

I'm pretty simple and don't have much in the way of material desires.