Hi! Thanks for buying the pack :) I see the issue, I would suggest to not use those high-res characters, these tilesets were made to create games with less resolutions, like the characters you see in Celeste (the game), or something near those visuals.
We are working hard to have ready a pack of characters for you to use, fully animated.
You can see briefly how they work in our city tilesets here: https://www.instagram.com/p/B722ylQIDrR/?igshid=mxv77o01dvbx
This example show characters also around that resolution: https://www.instagram.com/p/B0n1BjFnX1Q/?igshid=170fbf0erxrxn
A solution is to make that character a bit smaller and low-res. Then it will fit perfectly :) Sorry for the inconveniences. We will work to have the character pack 100% ready soon!
PS. We are thinking about including a base character for reference in all our Tileset packs aswell. Updates soon!