Castlevania Lament of Innocence models help

[o0DemonBoy0o]

You mean fix the flipped faces? Just combine all the different mesh parts together and weld all the vertices together with a threshold of 0.001 then apply a Normal modifier and tick the Unify Normals option. I would recommend that you separate different parts of the mesh like gloves, skin, armor ect., first before doing that to get better results. Sometimes it doesn't always work right if you just weld the entire model together.