I'm new to the game and i just got lucky i dropped Gargoyle-chan at nyankoropon. I'm trying to find guides and oppinions with some concrete numbers to use as base to build her properly. All i had in account was a video from Oni Crew, a nice video indeed and the only one i've seen so far.

Anyone who can share your experiences with gargoyle-chan would be welcome to teach me and many others who maybe passing the same difficulties Thanks in advance!

Similar question, also got the same yesterday, so I have one each of Satan Girl, Gargoyle, and Parvus Gargoyle so far (split through 2 of my 5 characters).
I checked the wiki and the English forum, but have not found any useful info.
I tried to ask in chat yesterday but did not get any answer.

It would depend on whether you would like to have it focus on attacking or supporting, but either way, defense seems to be a high priority. There is a video guide on it if you're interested to have a look. Some options may have changed with the recently improved way assist partners attack mobs:

https://www.youtube.com/watch?v=xa-JLB28k8M