Well the UK Government doesn't want me to but what do they know!
When I was thin, it never really appealed to me. I was too small to sit on people and having been sat on, it did nothing for me.
However... as I've gotten bigger and especially as I've gotten to a size that surpasses most people, it comes with a certain sense of... power. There's a strength in my weight that I've found surprisingly appealing. Getting to use that, my body, as an extension of me to exert a consensual physical control... has become an exciting prospect.
Anyone who knows me knows I have little bit of a guilty pleasure for being on my queen shit. Every queen needs a throne, ESPECIALLY when she's queen sized.
So...
Short answer.... at first no but now... yes!

Ya ba dibba dibba dibba dibba dibba dibba dum!
Oh wait... this isn't Fiddler on the Roof.

Any time I've had disposable income, I've never been any good at spending it on myself. Sure, if I was at a level of affluence where i was RICH, I might upgrade certain things in my life. Get a nice bed, replace broken or breaking things, make sure my partner was comfortable, overhaul my audio set up, maybe invest in singing lessons, update my wardrobe. But I was never one for making grand purchases.
Maybe set up a VTuber agency for VTubers outside the norm like fat VTubers like me?
PAY FOR A DAMN EDITOR AND A MANAGER. I badly need both of those but I can't afford either ;-;

My money tends to go towards supporting people. I love making sure people have the freedom to express themselves and create their art without having to worry about not making rent. Our community is held up by its artists, writers, game developers etc. I don't have much in the way of money now but most of what i do have goes back into the community through various Patreons etc. So I would probably just do that on a larger scale. I know what its like to struggle and I don't want anyone to suffer that.
Top tier on every ones Patreons. Anonymously dropping batches of gift subs and bits to VTubers who've been working hard. Paying artists and writers to draw or write something they've always wanted to do but haven't had the time because of other commissions.

Maybe buy a mansion to turn into my own personal harem of feeders and mutual gainers where I can be Queen Feedee and make sure all feedees can have their needs seen to who couldn't afford to previously...

I've been sitting on this question for a good month because I wanted to answer it correctly. Knowing how much I fumble my words and what I mean, I probably never will so let me have a go regardless.
My first time would be to detach whatever connotation you have to being a "fat fetishist".
It's just a different term for that fat appreciation. Fat is ALLOWED to turn you on. I get turned on by fat on others as well as myself. It forms my entire sexuality.
You can appreciate fat sexually, that counts as appreciating.
Seeing fat women/men/NBs as purely sexual objects is a separate thing entirely.
Kink does not equate to creep.
I've noticed a massive wave of puritanical attitude when it comes to ones own sexual feelings in the last few years as people choose to eschew their sexual gratifications as opposed to approach them and unpack them. Is it easy to attempt to dispose of your sexual feelings instead of having a conversation with yourself critically about them? Yes. Is it better for you and your well being in the long run? No.
If you feel that your sexual gratification outweighs your appreciation then that is something you have to unpack within yourself. Perhaps you're giving sexual endeavours too much weight in your life (pun intended) and need to focus on non-sexual things until you achieve balance.
To be aroused by fat bodies is not mutually exclusive from appreciating them or being an ally to fat liberation/body positivity causes. You can do both. I have been doing both my entire adult life.
If your fetishism of the body is outweighing your appreciation then it is a problem with your attitude and approach to sexual gratifications, not to the body itself.

A good question!
Kaleidocrystals are fundamentally multiversal energy weaved into a solid form. That means depending on how refined the form and who is touching it, its power output varies.
Refined by Ampla and in the hands of someone experience with converting that energy into something useful like Iona? Then its a very versatile and strong power.
An unrefined version of a creation of someone with nefarious intent like the one from Blood & Sand? Very powerful but incredibly unstable. Its a lot of power without any control.
If its refined well and in the hands of a non-variant, its practically just a nice shiny crystal. Probably prime tat to be sold in those witchy shops. Practically powerless.
So fundamentally they're very powerful when it comes to raw energy.
A variant is always going to get more power of it than anyone else due to it being energy fundamentally tuned to them.
You can power an entire complex, you can use it as ammunition or use it as a teleportation device.
Part of their strength is their versatility and attunement to variants.