So, I don’t really post my Homestuck ~*~speculations~*~ because I doubt anyone gives a shit, but whatever. I’m bored and have feelings.
ASPECTS: I think it goes without saying that UU and uu are Space and Time players respectively:

Also, green has been linked with Space (Jade, Kanaya) and red with Time (Dave, Aradia). THINK ABOUT IT.
TITLES: Considering the above (“stolen enough of my time” is really weird and specific word use…), I’m betting that uu is a Thief of Time. Why Thief and not Rogue? Because, as Roxy explained to us:
Also, any “time theft” seems to only be to his advantage:
As for UU, this is where it gets interesting. UU told Roxy that her class is “exclusively female”. I think this is UU utilizing “deception throUgh honesty”:
After this update, and considering the speculation that a Knight is key (along with the Space and Time aspects) in creating the Genesis Frog, I’m thinking that UU is a Knight of Space. Why? Read this part again:

She seems to associate herself with the knight chess piece. Basically, in her game session with uu as the only other player, Knight is exclusively a female class—deception through honesty right there. Additionally, the whole Queen/King switching powers/breaking “rules” gambit seems to go along with this idea. (Personally, I think it would be awesome to have a female knight and male thief.)
ANIMAL ASSOCIATIONS: Relating to the above, it’s basically been beaten over our head at this point that UU is associated with snakes (I don’t even need to compile a list of evidence here to attest it at this point), but we haven’t really been given anything to suggest what animal uu is associated with.
can get behind basically every bit of theory in this post. (Mostly involves linguistic analysis of the u/U chat...
the Genesis Frog thing) The frog is created...session. Creating
frogs could have something...frog temple on jades island,
like this! Especially...UU’s class. (How do...response...