Warning! Some things may change from the canon timeline of Attack on Titan! Examples are that Mike Zacharias and Frieda Reiss will not die in this story and etc. Remember that this is a fanfic and I will try my best to explain everything to the best of my ability! With all of that covered, I present the Bio of Y/N Grice!

Speech:
Speaking in their mind ' '

Your Name: Y/N

Last Name: Grice

Hair Color: H/C (Primarily Yellow)

Eye Color: E/C (Primarily Yellow)

Race: Eldian

Titan Shifter: Yes

Relatives:
Unnamed father and mother
Colt Grice [brother, alive]
Falco Grice [brother, alive]
Grice [uncle, deceased]

Age:
12 (Physically)(Year 845)

17 (Physically)(Year 850)

21 (Physically)(Year 854)

Height:
5'11 (Year 850)

6'1 (Year 854)

Looks: (Flexible)

Personality: Careless and Lazy(To anyone), Compassionate (ONLY to loved ones), Patient and Cocky (In battle)

Skills:
Speed is Y/N's speciality
Master of ODM Gear
High IQ on par with Armin and Hange

Human Scaling -

Combat: 7/10

Initiative: 9/10

Wits: 8/10

Teamwork: 10/10

Intelligence: 10/10

Endurance: 8/10

Agility: 9/10

Stamina: 9/10

Speed: 11/10

Human Ability:
Regeneration

Titan's Bio:

Titan Name: The Unification Titan

Titan Height: 17 m

Consecutive transformations: 2 - 3

Titan Looks:

Titan Powers:
Strength/Physique (Attack Titan)
Memories of past and future inheritors (Attack Titan)
Arctic Wolf Abilities/Arctic Wolf appearance (Beast Titan)
Jaw and claws hardening (Jaw Titan)
Enhanced Speed (Inheritor personal skill) [May vary between different hosts of this Titan)

Harem:

Mikasa Ackerman

Annie Leonhart

Krista Lenz/Historia Reiss

Sasha Blouse

Pieck Finger

Hange Zoë

Frieda Lenz/Frieda Reiss

Origin:
Y/N is the oldest out of the three Grice brothers. Y/N was a clumsy fellow who was forced to be in the Warrior Unit. Luckily for his family, he became a Marley Warrior because of his fantastic speed and intellect. Although, this won't last for long because one of their family members was an Eldian Restorationist. When Marley found out, they took advantage of this and they proposed that they would look the other way for them, but Y/N would be tested for Titan science. Unfortunately, Y/N's family agreed without Y/N's consent and he was subjected with Titan experiments. He would be tasked to go on a secret mission to Paradis Island but he was lost during the process. No one knew what happened Y/N Grice until Marley sent another batch of Marley Warriors to Paradis Island.