1st Idea :

To make him like Molten Freddy but with some key differences like giving him more suit and giving him parts from some charathers in the series. Basicly, making him like Blob but nerfed.

2nd Idea :

Making his structure a bit more chunky and mixing him with a Luigi animatronic (NOT LUIGINETTE) which will be more slim. Then giving him a chained flail or a human lore accurate battle axe.

(choose wisely)