As for the guy itself, I was looking for a loner, pure in Morrowind for the treasure that it guards. For the race, I'm thinking of a race I normally don't play (Altmer, Bosmer, Redguard, Orc) but can't think of a good motivation for any of them to solely on the unique treasures part. He shouldn't be afraid to murder people to get their valuables or pilfer them. One of the ideas I'm playing with is an Altmer who has been tasked by an extremist faction to locate Auriels Bow and Shield and take them back to Alinor, but becomes so obsessed by all the artifacts he wants to have them all, but I finished an Altmer Telvanni Archmagister who incorporated the Mages Guild with the Telvanni peacefully, so I'd like to hear some suggestions about some other races, or just a great motivation.
As for the artifacts themselves, I know a few, but not all of them. I'm not going to check the UESP or anything for any help. It'll be great to discover every secret Morrowind has, including Solstheim, Mournhold and parts of the Mainland. (there are unique artifacts in Tamriel Rebuilt, right?)