All you have to do is use any of the kimeras, and resize the model part from the battle model to the field model.
for people like Cloud to his field version, you need to start by resizing him to about 4% on the resize, then apply the changes to it.
past that, you usually have to resize it to about 80-90% for it to actually line up properly and not be too large.
Although, for things like the diamond weapon or other large enemies, you have to resize it to 1%, and its still huge compared to the field models, so resize it down again until you have it the right size for your purposes.
out of interest, what is your battle model?
