In the Fire Emblem modding community, "FE Animation" refers to custom battle sprites. A "Human to Cat" animation usually depicts a or Laguz style transformation.
You can find existing cat-human assets (like the "Ranulf" or "Lethe" sprites) in the Fire Emblem Resource Repository . Which "FE" are you working with? Human Cat FE Animation Script
You must own the animation asset or use a public one. You can find IDs on the Roblox Creator Hub . In the Fire Emblem modding community, "FE Animation"
The human sprite is replaced by the cat/beast sprite. Action: The cat sprite lunges forward. Sample Animation Timing Script: In the Fire Emblem modding community
Interpretation 1: Roblox "FE" (Filtering Enabled) Animation Script