Looks good. Just a few things. I would hold back from using the whole age unknown thing as it is basically just a filler for not coming up with the date that he was built. Theres also the issue of the steel he is made of being able to deflect a 50 caliber round. Knowing the damage of a 50 caliber shot, it will penetrate any steel and punch right through titanium plates. You need a pretty thick block of titanium to stop a 50. Heres a good example video that shows the power of a 50 caliber round and shows that steel has no chance in hell stopping a 50. https://youtu.be/C3fBkNIROg4
The katana is also not exactly an idea that would work too well considering every armor at this date made can stop a standard 5.56mm round. If the armor can stop that round, it will certainly stop a sword. The katana idea is also retired because of how ineffective it is compared to every other blade made at this time period. Theres also the design. It’s largely based off the combat bot and just seems like a modified version of it by someone in the Thaltop rebellion. With the story, Thaltop bots are made within factories. Every one of them are the same depending on the model. They are also all made with AI that do whatever they need to do to accomplish the missions they are given. Very few of the bots have unique AIs that can think in which I will get to at some point but they are all built with programming that will prevent the idea of betrayal. In which if they do end up betraying Thaltop, they will shut down. Though some people are able to bypass this proccess and have combat bots that go by their command. Other than that you got a pretty decent character.