I have a recurring entity that I encounter very frequently when I trip. I call him Teo, many have heard me speak about this entity at great length before. Teo seems to exhibit all the common signs of beings one's spirit guide, so that is typically the way I think of him (if you find that hard to believe, it's easier to accept than my other interpretation of him that he is an alternate future version of myself; like post death Tek). I say this because Teo knows me better than I know myself. To describe all of our interactions would just take far to long, but what will typically happen is if I'm coming up on a psychedelic I'll just know whether he's around or not. Sometimes I'll get a telepathic "Hey buddy." or "Ready to go?" message and I'll know it's him. When I breakthrough, it really feels like Teo is responsible for everything I see, it's like he scoops up my spirit out of my body and carries it through hyperspace, showing me places and other beings (one time he took me before four very important looking figures and they had a conversation about me which I can't remember as well anymore, another reason why I think he is my spirit guide).
I don't always see him visually, but when I have he is a very bright neon green color and humanoid in shape. Really he's composed of some time of ethereal spirit light that resembles the heat wave that really hot pavement gives off when you look at it just right. His head is rather triangular too, but I've never gotten a really good look at him enough to ever make out any details.
Other beings I've met:
An elf. Not the machine variety Terence talked a lot about, but the standard 3 foot tall, pointy ear, santa's workshop variety. This was the most intricately detailed being I've ever encountered, I could even make out the details in his cloths at the time of encountering it. When I made hyperspace eye contact with this thing, it looked horrified that I had spotted it and it simply poofed itself out of my vision. It was pretty awesome to be honest.
I've seen a bunch of gnomes. The elf I saw was very much entirely in hyperspace as its body was composed of light (seemed to look like a very brightly colored cartoon character). The gnomes were a little different. I was tripping with a friend of mine and while we were peaking all over her body were these little gnome men (specifically all males I remember). The gnomes were hammering and chiseling all the features of her body like it was a gnome village. Highly peculiar. It was like this vision was overlayed on top of normal reality, like if you had a layer in photoshop and you turned the opacity down like 50% so you could see the main layer underneath, it was sort of like that.
I've encountered the gigantic jeweled octopus being that some people around here call Opticus (and I think Philip K. Dick called this being Valis). All this giant creature did was wink one of the eyes on its tentacles at me, like to say "Yes hello, I see you there welcome!"
I 'flew' past a drunken giant with a robin hood hat one time as he was sitting on a hyperdimensional television set drinking a jug of something. On this box tv he was sitting on an episode of our reality was playing on it, which at the time caused me to question if whether our entire existence is a type of entertainment for other, higher dimensional beings.
I've encountered the entire muppet cast of the 1980s television program Eureeka's Castle (see signature line and avatar pic). This had a lot to do with some locked up childhood memories so I understand why I had this experience.
I've conversed with beings that I couldn't visually see but seemed to sense them with another type of sense (?). Anyways there were two of them, one distinctly male and the other more feminine and niether of them understood the first thing about being a human. They could simply not understand why I was 'playing with that thing' (my body if I understood them right) when everything was 'so much better' where they were. They didn't understand why anyone would ever want to play human (the male presence was more interested than the female, she was very disturbed that they were even talking to me).
There are more too but that's a good list for a wed morning