Thank you very much for all your help! You guys are awesome
I've ended up using blackhornet 's suggestion. It works exactly as I need, and with only 2 lines of code.
1. I give the monster eye a timer behaviour,
2. On Start of Layout, I start the timer with a random timeout.
3. On timeout I switch to the blink animation.
The timer sets up different random number for each instance, which is exactly what I need
Thank you again!