Honestly, I never really believed in ghost and such things, but I have no other way to explane what is happening. I'm posting this story because I hope somebody here has had a simmilar experience or maybe knows about something like it.
It stared around 4 years ago. One day I noticed a red silhouette of a man in the corner of my eye. I turned around and he was gone. I assumed it was just a trick of light and moved on. But it kept happening. I saw him every once in a while; he would just follow me in the corner of my eye and when I turned to face him he would be gone. At first I thought I was hallucinating (like I said I didn't believe in ghost or anything supernatural). I decided to tell that to my friends and we discussed it a bit and just went with the hallucination theory.
A bit after that my friend and one of her friends (with who I wasn't very close) and I went to see a play in a theatre. I saw the red man in one of the loges above us to the left. I mentioned that to my friend and the other friend (I will call her E to make things easier) noticed us watching that loge. E asked us what are we looking at and I asked her if she sees a man up there. She said she saw him, but he disappeared a second later. My friend saw the same thing. If only my friend, who knows the story, saw him I would assume that our brains are tricking us, but E didn't know about him so she had no reason to imagine it.
About a year later my cousin and I were hanging outside my school and it was about 7 or 8pm. We were casually chatting when I saw him standing a bit further from us. I asked her to turn around and she saw him. That was the first time I actually looked at him, but I still only saw a silhouette. We got scared and decided to go away. We started walking slowly so we wouldn't look suspicious to other people. We weren't looking at him for a few seconds at max, but when we turned to look at him he was gone.
A few months later my friend and her brother (I will call her V and him D because writing "friend" and "brother" takes too much time) were hanging out in the park. It was around 4pm. I saw the red man sitting on a bench a few meters from us. V noticed that I was acting strange so she asked me about it. When I said that I see him they both turned around and saw a man a second before he disappeared. V was sure he was there, but D was skeptical and said we were probably seeing things. He said that but I saw that he was tense and looked scared.
So in total 5 people saw him, excluding myself, so that means that there was definitely something there. I read a lot about ghost and demons that occasionally follow people but the experiences from those people were different then mine. In most cases the creatures would interact with them or the environment in some way but the red man only stands there and follows me. He never talked to me, moved anything, touched me or anybody else. He almost always keeps a few meters of distance between us but he occasionally appeared closer. One time I saw him next to my bed, but that was only once. If we are in a crowd it seems people move away from where he stands even though later there's nobody there. When he is close to me I don't hear any footsteps or moving sounds. I have no idea what he is. So far he doesn't seem dangerous but he gives me a uneasy feeling (like somebody is watching me). Whenever I actually look at him he seems like a silhouette of a man dressed all in red. I researched anything related to entities that follow people and found nothing related to him. And I guess that's how I ended up here.