Since it's a commercial product it's best to go to the source, contact the game's creators. If the game is model based rather than sprite based and allows modding the character mesh may already be available.

If it is sprite based the creators might be willing to share blueprint sketches of the character for creating a mesh....you never know they might really like the idea.

Either way you would still be in the position of finding an interested modeler to convert to or make the Poser model but your chances of success would go way up.

Best of  luck.

(The reason for suggesting the creation of a new mesh rather than morphing an available model is so the game creators could use the model free of any legal entanglements.)