Congratulations Buddy,
It looks different than others, Particularly freedom of sharing Exp, Np, Noah, etc. It should be tested enough because it is available to be exploited too.
Moreover,
* Can we "heal, cure, teleport etc." them?
* Can they teleport us when we want? (by writing "4444" to the party chat etc..)
* After joining to the party, do they follow Party Leader? (ultimately, we want them to be a party).
(These are my opinions to improve, and I hope it gives you a different point of view.)
Thanks a lot.