Do you plan on putting them in the same cage? Are you planning on breeding them? because if you put a female in with your male ( and he is not neutered ) they will mate and you will end up with not only 2 chins but their babies as well. And if you got your male from a pet store, you should not breed them either by accident or on purpose, as you do not know his genetic background or health background.
You can go to the breeding section on here and look at the stories of people who had a female give birth and thing went horribly wrong with the birth and they lost both mother and kits or just the kits. Males and females can mate even when they are in separate cages if not separated a good distance apart. And you can not let them have play time together as they will mate then, as well.
If you must, and this is a BIG must, get him a cage mate from what I have read on here it is best to go with a younger same sex chin. But with this comes introductions and the possibility they will not, or ever, get along and will have to be separated anyway. This means you would have to have another cage, toys, accessories etc on hand for the other chin. And if you put the female in with the male you would need to buy a kit safe age for the kits, as cages meant for bigger chins are not meant for the kits to live in as they can escape.
How long have you had Upgrayyed? Have you had him a while or he a new chin? Chins do just fine on their own and although they are of a pack mentality, they do just as good by themselves. If he seems lonely and you have only had him a few weeks, he may still be getting used to you and his new surroundings and adding any cage mate could possibly stress him even further.
I know there are others on here that are more knowledgeable than I, and I am sure they will give you even more advice, but this is just my opinion and my knowledge on the subject.
