Gl4re:
Concepts: The conceptual is something incredibly important to the Nasuverse. Entire battles can be won and lost due to conceptual advantages. Some Servants themselves represent whole Concepts, or wield a Conceptual Noble Phantasm. Let's see Servants of the likes of Nursery Rhyme, Nikola Tesla, and Edmond Dantes!
Just some additional thoughts to clarify: I'd also consider centering a character who possesses a conceptual advantage (like Muramasa vs the Tokugawa), or Origin related things (like Sherlock) to. count. As long as the end result is resulting in a write-up with the conceptual as part of it, then it's all good.