I saw a video about Attack on Titan gear mod and I downloaded it, but there wasn't a good Titan mod to play with (at least It was what I saw). So I've learnt making mod and here It is. Here is a video that explains mod: https://www.youtube.com/watch?v=_mVnu0nUgNo&t=
Also they might spawn in the overworld with different percentages for each Titan.
I probably won't update this mod because It was a desire for a short time.
Enjoy your fight with Titans