There are some ideas that I want in this.

1. NPCs:

(Half Life 1)

- Gordon Freeman
- Gordon Freeman (From Blue Shift as a Scientist)
- Half Life Decay Main Protagonists
- Hard Life Security Guard (If you select HL1 Security Guard in the menu will spawn Orginal or Hard Life version)

(Half Life 2)

- Beta Barney Calhoun
- Beta Alyx
- Beta Combine

2. Busy mode and new voice lines.

You can choose in the menu to make character busy like:

Scientist - Please! Leave me alone untill after the experiment.

3. Logic:

NPCs should enter your car If you are inside of It.

4. Props:

There should be some props like more Half Life 2 props or Half Life 1 HEV Suit, just something!