Color animations in magos are modified in geoset anims. You need to know some math since they aren't in rgb normal. They in normalized bgr. Texture animations can be two things. One you changing the texture by an animated texture id in a material layer. The other is wrongly named in agos as texture animations. They are actualy texture vertices animations. For them you'll most likely just animate the translation. They just move the complete unwrap.
well, what you need is to change his armor to something that that is suiting and contrasting at the same time, for example, dark earthy body should be contrasted with really light colored stone armor, or maybe even white marble. let a bit of your creativity pull you i for an example, haven't seen many people use the terrain tile textures that game has, for a model
next thing you could do is to separate the body of the firelord into rock-like chunks, since, well.. rock isn't that 'fluid' as lava
next.. might wanna remove the tint he has and tweak the particles so that they're earth-ish, instead of being still like from the firelord