A character competition isn't something difficult to have - i.e., it follows a set formula and works itself to completion. The main difficulties with the last competition were the initial concern about the number of participants (which was solved by allowing someone multiple entries, and increasing the length of time for people to come up with ideas) and where topics would sometimes not be posted right away (which could be solved by having more than one person able to post topics so that the burden of doing so wouldn't fall on that one person).
I guess my point is that if you really wanted to have another character competition, why not just do some quick planning, maybe talk to Mirby about helping you and promoting the event on ZFGC given that she's a journalist, do the setup, and then as mentioned let it work itself to being complete. Any of the stylistic details you might want to have to make this character competition unique could be figured out between the hyping up and the start of the competition; from both staff involvement and community contribution.
There might be more interest from everyone too in terms of kicking the event off as the event isn't directly in the immediate shadow of the last character competition.