I think it might be a type of crassula. Any help appreciated :)
I believe a type of Rhipsalis. Yes, it is a succulent, but it is also a cactus.
Yes, this is indeed a Rhipsalis, R. cereuscula, to be exact. This will actually grow into a very large, trailing plant which will do best in a hanging basket. Rhipsalis are true cacti, BUT they are tropical, epiphytic cacti native to the rain forests of Mexico down through South America, related to the better-known "Christmas cacti"(Schlumbergera sp.) and "orchid cacti"(Epiphylum sp.), so their care is quite different from that of what people normally associate with the word "cactus", a xeric, desert plant. They don't need to be kept wet, but they do not like for their soil to dry out completely, either. These prefer a filtered sunlight, like what you'd find under most trees. I have several species of Rhipsalis, including this one.
Here is a link that might be useful: Rhipsalis Website