Use the Highlight object (built into Roblox) to wrap around the target.
To avoid anti-cheat "fly" detection, developers use to move the character smoothly toward NPCs rather than instant teleporting. Roblox Blox Fruits Script - Autofarm, ESP, Tele...
Teleport the character slightly above the NPC's head to avoid taking damage while attacking. Use the Highlight object (built into Roblox) to