Is md2 files are easy.

I think characters WAD are hard and I saw some people say md2 make is easy than wad so can you post your answer please.

I'd say it's easy if you know what you are doing. Some background knowledge of 3d models is required, and how to make proper frame animations.

What I did to get to learn how to make md2s, is use the well-known program 'Misfit 3d' and learned all the tools and settings there, then I simply made frame animations of a model following the frames that a character wad has. If you are determined to actually try and stick with it, you could pm me and I'll respond a full response on how to properly make a md2 model, and how to make it work in srb2.

There’s no choice; But take orders to attack

I'm not 100% sure on the matter, but I think you'd only need to make one model as opposed to... a fuckton of sprites.

Of course, making a model is going to take a lot of effort and fiddling.