Aesthetic is ok, seems very versatile and customizable (wondering if responsiveness for mobile devices is available).
Personally, I would make the inventory section a list like; a single char can carry from 100 to up to 200 items, so it could result a bit stressful with such large graphics (priority is given to the item img, list gives priority to names/IDs). As for storages, if it is thinked in the same way. Search module could also help.
Equipment section could be improved. Something like the alt+q user interface, available in game, including some "expansion" (mouse over descriptions with details - enchants, ie - similarly to divine pride), would be nice. Actually, the whole game can be emulated in browser, pretty sure it could be done in your CP for the equipment window and be customised for your goal.
Aside from fancy things, being a whole new CP (it is completely new or a flux refresh/update?), I would test massively security and privacy.
Really like the content, release updates anytime you have. Following the topic.