Hmmm...
This one's a hard question to answer
Truthfully I'd want to Summon Arturia Pendragon
But...
Since I can't I might aswell get my own Servant
And he is;
Ike, the Saber Class Servant
Ike is the son of Greil, leader of the Greil Mercenaries, and takes leadership when his father is killed by the Black Knight. For the most part of him being the leader of the Greil Mercenaries, he is in the service of Princess Elincia. Ike is rather naive, but grows into a brave warrior later on. He is a nice and brave character, and is very protective of his friends and family. His motivation is to avenge his father's death, but he seeks no reward in aiding Crimea's liberation and helping Elincia to claim the throne as queen, except for the usual payment as being a mercenary. Although he has no desire to become a noble, he accepts the title as Lord so he can lead the Crimea Liberation Army.
Eventually, near the end of the campaign to regain Pricess Elincia's Kingdom, he acquires the Divine Blade Ragnell and duels the Black Knight with the assistance of his sister Mist. The castle in which the duel takes place collapses, and the Black Knight is declared dead (Canonically, Ike slays the Black Knight).
Ultimately, Ike reconquers Crimea with the help of his allies.
Noble Phantasm: A
Strength: A+
Magic Resistance: C
Endurance: A
Riding: B
Agility: B
Instinct: A
Mana: C
Luck: E
Charisma: A
Abilities
Riding
Rank: B
Ability to ride things. He can ride most vehicles with above average skill, but he cannot ride those of demonic beast or holy beast rank.
Charisma
Rank: A
Natural talent in commanding a large military force. Rank A can be said to be the greatest popular support obtainable as a human being.
Noble Phantasm
Ragnell: The Divine Blade
Rank: A+
Type: Anti-Unit~ Anti-Army
The weapon itself is a large golden sword with a black hilt and handle and is immensely heavy. Despite this fact, Ike is able to wield this heavy two-hand sword with but only one of his hands. It has great power and accuracy, as well as being able to hit enemies at long range. Ragnell was blessed by the goddess Ashera, making the blade unbreakable. Ragnell also has the ability to be a thrown weapon, what makes it special is that when thrown it will returns to its wielder's hand when it reaches a certain distance (8~10 meters).
Ragnell, along with its sister sword, Alondite, was forged to smite the Goddess Yune by the beorc Trueblade Altina, first Empress of Begnion.
Sure sure. I copy and pasted most of this, sue me then. I'm trying to give as much information as I can