I have some spotty experience, so if someone is interested in UTAU lmk! I'd link resources, but... there really isn't much to speak of. It's very trial and error and tutorials are very... here and there? They exist, but are somewhat hard to find and usually not extensive. But for anyone interested, UTAU is basically Vocaloid but free, and user made vocal banks!! You can also make your own and it's VERY cool.
And for someone wanting an even easier option,
RVC exists. It is very easy as long as you have access to the vocals you wish to sample. VBs exist, but vary in quality, ethics, and legality. Imo, as long as its for memes its fine, but it can get weird fast!!
Lastly, SynthV has a free edition, and I personally think it's the easiest to learn of the Vocal-Synths. It has a good quality sound, easy mechanics, and is overall a solid piece of work!!
https://dreamtonics.com/synthesizerv-gen1/en/download/