A girlfriend is not a plot device. In a healthy relationship, you are the protagonist, not a supporting character. The most captivating romantic storyline isn't the one where he saves you; it's the one where you are walking side by side, saving each other from the mundanity of life.
: Give her a backstory, career, or hobby that existed before she met the protagonist. This creates "teaching moments" that lead to natural vulnerability. sexaloid girlfriend best
The ability to swap "heads" or upgrade internal AI modules ensures the companion ages with the technology rather than becoming obsolete. A girlfriend is not a plot device