Skin mod

This quote is from 2012 from a Rioter named Lomar

TLDR: No-modification clauses are standard in software EULA/ToS documents. LoL has always had one. Custom-modding is always at your own risk, but we generally don't ban for anything unless it's clearly harmful to LoL or our players. The vast majority of custom splashes/skins will NOT fall into this bucket.

Depends on the program you use. I can confirm as of today, Wooxy is a safe program.

https://support.riotgames.com/hc/en-us/articles/225266848-Third-Party-Applications if you have a question about the one you are about to use ask riot support they may be able to say yes or no to it but all 3rd party are use at your own risk

So can i use some custom skin by using Wooxy or its still unsafe?

well anyway playing as normal is gud tho so i'll play like that way

Thanks for the help

Here is a list of programs compiled by Wuks that has some of the common ones that are listed as definitely not-allowed.

The thing is, even though you are using it in normals and not ranked matches, doesn't mean you are allowed to use it if the program becomes blacklisted. With any program that modifies League of Legends in ANY way, it is "use at your own risk." There is the potential for it to become a bannable program in the future. Many of the custom skin softwares also contain other functions that give unfair advantages, and even if you do not use those specific functions, having them on your computer and using that program can flag your account.