Purple GUI
No, this is not intended for pvp, it is more like a general-purpose GUI resource pack.
Add-ons!
Check out my pack Purple Icons! It kinda works as an add-on for this pack.
Also there is a "Purple Modded GUI" pack, just click on the version of the pack that you are/will be using and scroll down, there should be a "Purple Modded GUI" file to download, then put it on top of the main pack in the resource pack screen.
Mods supported:
Hotbar Preview
Hotbar Preview with Purple Icons
Quick Suggestions
I recommend to use it with Icons and this add-on for better immersion.
Also, if you want a shulker inventory preview, I'd recommend to use Inspecio so the tooltip uses the pack's inventory. It also has lots of other QoL tooltips c: