Fate/stay night, Zero no Tsukaima Recommendations
In both anime, the main protagonist is a mage and summons a familiar/servant.
The story lines are completely different, but both anime have one of the characters summoning a male familiar spirit. Both have magic and someone who is the lone survivor of a village.
Zero no Tsukaima is more ecchi though.
These two anime are similar because of the romance in both of them. The familiar of zero does have more romance, but they prove to be similar. Both main characters have a "familiar" (familiar of zero) or "servant" (fate/stay night) which is meant to be their companion. There is definitely some romance that goes on between them in both anime. Another similarity is that the main guy character does sometimes experience romance with other girls, not just their master/servant. Although it is obvious that their meant to be companion is who they are destined for. There is also magic in both anime, and the main
As both anime focus on magicians with their "summoned helper", the plots are rather different at some points. First they share the similarity of "doing what is right" which will lead to the inevitable dilemma's. In both series the main characters develop a love relationship with their "helpers".
The differences between the series are more at a sub-level: Zero no Tsukaima focusses more on humor and the main plot, so the action is more a side-show, where in Fate/stay Night the action is a bigger part of the show. Also, Zero no Tsukaima has some elements of ecchi in it. Where this usually is