[quote]
2. No over powered servants. Demi-Gods, and servants such as Gilgamesh, Beserker Hercules, and folks of that nature are not allowed. I can't have unkillable servants that make everyone else pale in comparison. Ask before you pick a servant, and I'll help you with them if need be. The preference is towards middle of the line servants such as Robin Hood, or Qin Liangyu

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As rule states I'm looking around the road of those who can hold their own in a fight, or at least provide some sort of a support role like Hans. I'm not looking for the Cu Chulainn's who can auto kill most servants without high dumb luck, or can render someone apart like King Hassan, or Medea (ruler breaker is obviously hard to nerf and can essentially overlook lore.). Its for lack of a stick so to speak so I don't let anything through that can be abused as my belief is that if something can be abused, and thus weaken the story and the other characters involved, it will be. As for extra class servants I am willing to consider them on the lower tiers but its a case by case basis. 

Pseudo Servants? I guess but that brings in the weird stuff of how and why.