Self-insert

[Joss Whedon] loves sexualizing her, like […] making her fall for his self-insert Bruce Banner.

Source: wiktionary

The female character has to be likable. She's a self-insert for the female viewers so she probably won't be unique, but watching her interact with other characters can't be frustrating.

Source: wiktionary

For centuries, the commonest forms of implant had either been grown in situ or were designed to self-insert painlessly via existing orifices […]

Source: wiktionary

In Oregon, a group called Ceek Women's Health has begun clinical trials for a series of new devices—including […] a speculum that patients can self-insert.

Source: wiktionary