The Fate franchise is the creation and intellectual property of Nasu Kinoko and Type-Moon.

Justice League is the creation and intellectual property of DC Comics.

Tales as Old as Time.

Assassin.

"Congratulations, last Master," Oberon said, standing over Ritsuka, "for making it further than I ever expected you to. But ultimately, it is no matter. Your so-called normal course of Human History will remain deleted, and-"

Ritsuka clenched his teeth. "Professor Palmer," he said through the pain. "Do it now!"

"Professor Palmer? Who is-" Oberon said, right before his head exploded from within, as a man in blue and red tights grew up to normal size inside of it.

True Name: Raymond Palmer.

Other Names and Aliases: The Atom, Ray.

Alternate Classes: Caster.

Alignment: Lawful Good.

Attribute: Human.

Natural Enemy: Ant-Man.

Parameters:

Strenght: C

Endurance: D

Agility: B

Magic/Mana: C

Luck: C

Noble Phantasm: EX

Likes: "What I like? I like simple pleasures. The satisfaction of a well done job. I suppose I like lecturing others, as long as they actually are willing to listen."

Dislikes: "This Servant thing, I'll admit I really don't like it. Don't get me wrong. I like you, even if calling anyone 'Master' still feels kind of wrong. But it's not like the superheroism we used to do. If we weren't needed, I'd be all too glad to quit."

First Ascension: Ray stands on some grass, which is visibly taller than him, wearing his classic Silver Age red and blue spandex uniform.

Second Ascension: Ray leaps through a jungle, wearing his eighties 'Sword of the Atom' costume and swinging a blade. In this Ascension he also attacks using this sword.

Third Ascension: Ray flying through atomic subspace and clad in his current red and blue armor.

Final Ascension: Ray as a glowing human figure surrounded by flashy effects.

Biography:

From the official chroniclers of Universe DC-1:

The living embodiment of 'Size doesn't matter', the Atom unleashes all the power of his namesake against evil.

Ray Palmer, research scientist, created a 'white dwarf lens' that gave him control over his own mass and size. As the costumed adventurer and hero Atom, he fought many villains and strange menaces across time and space, not only alone but also as a member of the Justice League of America. For a brief time, Ray Palmer went undercover and a man named Adam Cray stood in as the Atom.

Class Skills:

Presence Concealment: EX

Assassin is nearly undetectable, not because of the standard training into stealth, but because of the gifts brought by his size altering powers. See Size Shifting below. He can make himself invisible to the human eye and ear, hiding virtually anywhere and even within enemy Servants, all the better to finish them off. In the hands of anyone with a lesser moral compass and standards, those powers would make them lethal to extremes that challenge human understanding.

A hero of the vulgarly known as 'white bread' variety and rather old fashioned, Palmer would rather not resort to murder usually. Only the Grand Order disruption and its special humanity-endangering circumstances have convinced him to use his power to kill Servants if necessary.

Personal Skills:

Martial Arts: C

Ray Palmer knows judo. While an excellent practicioner by average human standards, he is still far from remarkable when compared to Heroic Spirits more adept at hand to hand combat.

Mass Controlling Combatant: B

By manipulating his body mass, Assassin can fluctuate more density into his feet and fists, making them hit harder and more efficiently. This makes for a valuable tool in close quarters hand to hand fighting.

Size Shifting: EX

Thanks to the special white dwarf star belt he designed, Assassin can shrink to subatomic sizes, and any other size in between his human normal size and atomic level as well. The transformation is instantaneous and helps his presence concealment greatly. Even when shrunk, he can hit just as potently as before, thanks to his mass manipulation stated above. This makes him a very difficult target to hit by nearly anyone.

Despite all of that, as a Servant, Ray Palmer cannot use his powers to grow up into a giant size like Ant-Man, even though otherwise his abilities surpass those granted by Pym Particles.

Noble Phantasm:

Atomic Mind Bomb- End of the Twilight Days: EX

Assassin flies (or rather displaces himself through the molecules of the air in a linear fashion) towards his target, enters their head through the skin, an eye or the nose, and quickly makes his way to the brain or its equivalent. From there he unleashes the charge of his white dwarf star belt, causing an explosion and a chain reaction of serial bursts that is intended to destroy the opponent's brain.

Through most cases, unless the opponent is extremely resiliant or gifted with incredible regeneration that is fast acting enough to save their life, the target's elimination is guaranteed, but the most likely outcome has Assassin himself perishing as well. He is obviously hesitant to deploy the Phantasm.

Start of Battle:

"Big beatdowns come in small packages!"

"Get your science right!"

"Professor Atom's lesson is starting up!"

"I won't shrink from this challenge... Ahh, sorry, that was stupid."

Attack:

"One, two!"

"Surrender?"

"Give up?"

"I'm not enjoying this."

Damage:

"Geh!"

"Ooffff!"

"Master, stay back!"

"How could you!"

Damage by Noble Phantasm: "Oh God!"

Victory:

"Thanks for your time."

"Lesson's over."

"Let's not do that again, okay?"

"Sorry it had to come to this."

Defeat:

"Use my research to summon Ryan, will you please?"

"No... No..."

"I'd like to believe we accomplished something."

"Justice will still be served."

Summon: "Nice to meet you. I'm Ray Palmer, the Atom... Servant Assassin, I suppose. Ugh, I hate that word. Assassin. Huh? Wondering how we'll get things done with this attitude? Relax. Figuring things out is what I do for a living."

Noble Phantasm Activation:

"This is how I once killed Darkseid! Prepare to have your mind blown up!"

Extra Dialogue:

"How many wondrous things you must have seen. All the planets you must have visited. Please tell me of- Ah? You, do you want to play? Kick the can? But that... couldn't it wait, please?" (When you have Foreigner Voyager).

"I really enjoyed our conversation. Maybe you are right, and us men of science can learn a lot from you. Your people... They remind me of friends I once had..." (When you have Caster Geronimo).

"Ah, Diana. Princess Diana. Always the stalwart, reliable one. I'm honored to fight by your side again." (When you have Lancer Wonder Woman).

"A Thanagarian?" (When you have Saber Sakurazaki Setsuna).

Birthday: "Happy birthday! Well, I'm kind of an egghead, so I'm not much of a party animal, ha ha. You're still a kid, so it's not like I could take you drinking like Guy Gardner would."

Event: "I suppose it'd be asking for too much for that to be a science fair, huh?"

Holy Grail: "Jean... Despite everything, I'd like to see her again. I know it's selfish."

Next: Beowulf's nemesis. Sort of.