All That Glitters - A servant who has strong ties with gold. It can be someone who had a large amount of gold in life, or wanted to obtain a large supply of gold in their lifetime. This is not as vague as “someone who liked money”, it must specifically be gold and not any other type of metal or currency. However, their ties to gold don’t have to be for monetary reason, just as long as they themselves have some ties to gold.
You Either Die A Hero… - A servant who did good deeds most of their life, only to turn “evil” near the end of their life. It doesn’t matter how “bad” their “evil” deeds are, they can be anything from being greedy to being a cold-blooded killer, just as long as they changed from good to evil during their life, it qualifies for this prompt. A good example of a canon Fate character that fits this is Gilles de Rais.
He’s More Machine Than Man - A servant who not just has a strong technological influence in their lore, but who specifically alter themselves as servants to either become one with the technology or rely heavily upon it. This can include anything from piloting a mech, to using technologically advanced prosthetics (something like either steampunk or futuristic style), to even becoming a piece of technology themselves. A canon example of this would be someone like Charles Babbage.