Alright, here is my attempt at Ultimate TA (and since the game is lacking in a lot of sexual/bondage clothing, we cant very well make the REAL Ultimate Thors Assassin

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I tried doing as others suggested and streamline his original costume. Since TA left out whether this ultimate version of TA is good or evil, I went with a good version.
Ultimate TA 1
Ultimate TA 2
I dropped the hood in favor of something else. First I had the wings on his head. It looked ok but really had no relevance to TA or the evil incarnations of him. I ditched those for a Viking look because LoV has the horns growing from his head. We all know TA is horny, but horns growing from a hero didnt seem appropriate; at least I dont think it does. The ninja mask covers his facial features like the old costume did, this one is just a little more real and is from the AoT days (and I like the blue line as a highlight

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Since were staying with a real look, I changed his spiked shoulder pads to something a little more realistic (it also protects more of his arm this way). The gloves are streamlined into something a little more manageable too. (a note on the gloves
I realize the blue is a lighter than the other blues in his costume. It seemed good at the time to add some highlights to the costume. After I finished, though, I realized the blue squares almost look like a mini screen that allows TA to monitor his power levels lol. Too much thought into this? Yeah I agree. Its what happens when I get bored.)
The remaining part of his upper body is covered in the armored pads. Since, to my knowledge, TA has no reason to wear heavy upper body armor; this allows him to move more freely in combat. His belt is the same as before because
well I like that belt on him. His lower body is covered in light armored tech. Assassin of Thor had this same pattern (techbot pattern) as a top at one point; maybe as pants too, I cant remember. The boots are the same as the gloves to keep the costume in balance.
Since Im too lazy to go through the process of making another version, if I had to change anything on this one Id remove the Viking cap/horns, replace it with TAs normal visor and go with the long hair option.
My vote goes to Sass though