If you want to express love playfully, you could try:
* Making up silly sounds: "Gleep gloop, blorp!"
* Using a made-up language: "Flibberty gibbet, I wub you!"
* Saying it backwards: "Evol I"
* Writing it in a funny way: "Luv u, boo-boo!"
Remember, the key is to be creative and have fun with it! 😄