Best way to lock and unlock secret characters with script?

[Bloodbane]

I've updated Map demo with many things including 2 script requests, you can get it here:

https://www.mediafire.com/?r7meg1g5hk6kqiv

Read playing notes for more information
This demo also has switch and gate which corresponds to the switch. There's other thing related to switch but play it yourself to see what it is and what it does

 

[DJGameFreakTheIguana]

Nice tech demo Blood. The switch is a nice touch, though aside from opening the door, I didn't notice anything else. 

x)

 

[Bloodbane]

Oh I was referring to switch mechanics not the lever IOW there's another entity which works like switch