This is HUGE. The most effective action to take to prevent yourself becoming narcissistic supply IS TO SET BOUNDARIES. Now that I know this secret, I set boundaries for everything: what behaviour I will accept; what I will believe; what I stand for; what I will not tolerate or accept, making sure that I don't allow the lines to be blurred; who I am, and who I am not. I recorded a video on this topic. Watch it here.
My five traits are my: highly empathic, heart-centred, trusting & sensitive; a people-pleaser. passionate & enthusiastic about my life service and life in general; my innate vitality. personally accountable/responsible for my own actions, thoughts and behaviour; hard worker; dependable. low self-esteem & self-confidence; keep a low profile. above average intelligence. Note: Since writing this post and recording this video, I've realised the biggest reason narcissists are attracted to me is that I had poor to no boundaries. A video discussing this more is planned.
My five warning signs are: no evidence of empathy red flag tingles any, even slight, invasions against my boundaries, especially if I feel doubt or slammed/belittled/disrespected if I feel even slight incredulity at a story if there is any sense of God-like or worm-like attitudes I made a video on this topic. You can watch it here.