It doesnt specifically have to be in this setting, no. As long as it shows a clear grasp of the character and how they react to things.

Honestly considering most people write their samples as their intro log/network post in most apps Ive seen at games this would be a refreshing breath of fresh air.

I do ask that if it hasnt been written semi-recently you might want to get something a little less dated perhaps?

Go for it! :)