It would be cool if Portal main character could be choose from the character selection screen...
-Pros: Can shoot portals 1 The cursor of the mouse, or the up and down keys to aim 2 shift/left click to shoot
-Con: Maybe Headcrab speed
The "portals" launched could just spawn after hitting something solid,
If possible, she could be introduced with the Portal 2 launch date, for celebrate it.
Tell me what you think!