If you want extended functionality without the risks, consider:
No. WhatsApp Watusi is primarily an Android phenomenon. iOS has a "walled garden" architecture that makes sideloading modded apps extremely difficult and unsafe, requiring a jailbroken device. Most mods, including Watusi, are Android-exclusive. whatsapp watusi android
You can now change bubble colors and backgrounds directly in Settings > Chats > Default Chat Themes WhatsApp Beta: Joining the WhatsApp Beta If you want extended functionality without the risks,