The first question that needs to be asked for a request like this is, have you already looked through the gallery to see if there is already something that matches what you need? If the answer is no, then you should do that first.  There's not much point in having a gallery like OGA if every project needs everything made from scratch.  If the answer is yes, you have looked, but no, there is nothing suitable, that's fine, but it would be very helpful for you to say why what's already available isn't workable.  It will give a lot more direction in making a new set if someone does choose to do so.

Aside from that, you're missing just about every other key detail that's needed here.  What resolution? What medium? What genre?  What is the scope of this project? If it's just a fun experiment or a learning project, then you really don't need someone to pour hours of their time into a custom character.  The FOSS status of your project would be handy as well.  We won't stigmatize you if your project isn't open source, but some people here are likely to be more interested in contributing to a project which is going to be.