A utility Lancer with her attack buff and defense drop, however she can serve as a great damage dealer especially with the content currently avaliable. Her NP also ignores defense which allows her to deal consistant damage.
Very good scaling on her NP with access to a high ranked Prana Burst gives her one of the most powerful NPs currently avaliable in the game in exchange for having low HP (Which isn't very significant early in the game).
A star at taking hits, a 3 times Guts and one of the most powerful buffs in the game allows her to deal great damage, though later released servants will outshine her in pure firepower. Her NP allows for combos with its defense drop.
Marie's skillset allows her to stick on the field for an exceedingly long time by relying on her heals and invincibility. While her NP does not provide a large amount of damage, it does provide utility in the form of a party heal and debuff removal
One of the most versatile servants in the game. She provides very powerful defensive buffs from her skills and NP. Futhermore she can provide invincibility and a 1 turn taunt on herself. Mashu has good NP gain and can keep a team alive. Oh and she has 0 cost.
High damage with very good survivability from his skills, especially when he has his bond CE equipped. Nine lives is an exceptionally powerful single target NP and Heracles will wreck most stages with his NPBB combo.
A crit damage based Saber, who can generate his own stars and use them effectively (he can draw stars to himself) to deal damage and generate NP gauage. He has access to a NP-A-A combo making it easy to NP multiple times in a battle.
Very offensive orientated servant who doesn't have any defensive skills. He has good star and NP generation, allowing him to use him very powerful NP multiple times. His NP also applies a quick buff scaling on overcharge.
A support based servant who can charge the party's NP gauge when using her NP, while also bringing useful support skills to the table. Her NP can also do good amount of damage, and can be cycled easily with a NPAA chain. Have I mentioned that she's free? (provided that you cleared the event)
A sevant who is great at using stars, with an amazing crit damage buff on a very low cooldown. His NP also deals bons damage against enemies with the Fiendish trait, which is a rare upside. Important to note that he does not generate many stars himself, needing to rely on his team
She is the Lancer damage dealer, dishing it out in the form of crits and a powerful AOE NP which ignores defense. In exchange for being powerful she has problems gaining NP gauge. She is also rare due to being story limited.
Artoria's NP is a single target Arts, which can be combined with her skills to cycle her NP very effectively. Her cards provide good NP gain and can be used with some servants to NP twice in a row. Her skills bring both self support and team support, and giving her decent sustainability
She has high defensive capbilties for a Berserker with her defense skill. Ibaraki has good NP generation, especially when using a brave chain starting with Arts. Her NP itself is no slouch, especially when combined with her first skill.