Most modified people in the world

1.Eyeball Tattoo
Corneal tattooing is not only possible, but it has been known and done now for over 2,000 years — it became almost commonplace in the late 19th century and into the 20th century to correct defects such as corneal scarring and leucomas. These days, it is done less often because contact lenses are very effective at covering these defects, and prosthetic technology is also more accessible. However, not everyone can wear contact lenses, and not everyone wants their eyeball popped out even if it is blind; hence cosmetic tattooing of the eye.
2.Scarification
Scarification is the creative and artistic application of scars in a controlled manner to achieve an aesthetically or spiritually pleasing result. In the process of body scarification, scars are formed by cutting the skin. Even though many people hold that scarification is no more painful than tattooing, it is somehow more "intense" to most of them.

3.3D-Art Implant
A 3D-Art implant is any object implanted fully under the skin for the purpose of affecting a sculptural change of the surface. The "invention" and popularization of implants as 3D-Art is credited primarily to Steve Haworth. Implants can be stretched just like piercings. A good example of this are horn implants—they start as smaller implants, and are then taken out when healed and replaced with slightly larger ones. This process is repeated to achieve the final size. There are some risks of irritation to the skin above the implant if this process is pushed too fast, as with all stretching.