Hello,
You’ll want to setup an anim preset which is what will allow you to change how it walks and runs by just pointing your locomotion animations in there, no Verse needed. How to create a animation preset for NPC character definition?
“Attacks” will require you to be creative with the Verse function PlayAnimation where you can specify animations to play, using this API Play Animation Module | Unreal Editor For Fortnite Documentation | Epic Developer Community