Kakashi Hatake
The Copy Ninja. He's copied a thousand jutsu. Starts with one extra reroll, finds twice the seals and reinforcements stay twice as long.
Jutsu kit
Kit jutsu show up more often on level up. Some are only learned later in the saga, as in the series.
A lightning thrust at the nearest enemy. Pierces anyone in between.
Copies and uses a random jutsu, different every time.
Space twists and sucks enemies into one point.
A wave of water surges out from you. Pushes back and slows nearby enemies.
Plus every Academy jutsu: Shuriken Kunai Shadow Clone Jutsu Poisoned Senbon Paper Bomb Kunai Kunai Rain
Secret technique and evolutions

Secret technique: Raikiri

+20 health, +1 reroll, -6% cooldown
Secret technique: Kamui

+30 health, -8% cooldown, +15% damage
Secret technique: Kamui Raikiri
Forms change with the saga
Some evolutions change look as you move forward in the story. Level and bonuses stay the same, while title, sprite and secret technique change.
Lv 10

Secret technique: Ninja Hounds: Tracking Fang

Secret technique: Kamui
Lv 20

Secret technique: Raikiri: Lightning Blade

Secret technique: Kamui Raikiri
Secret techniques in action
Every form has its own secret technique, with its own effect. The strike hits every enemy around the ninja.
7 costumes: you'll find them with their conditions on the ninja's sheet, in the game. The almost-ready ones are in What to do now.
Possible combined jutsu
Fusions Kakashi can obtain alone at the Seal Altar.
Build tips
His kit's natures: Lightning Pure chakra Shadow and Genjutsu Water.
Strong against
Legendaries weak to at least one kit nature: Shukaku, Kimimaro, Sasori, Deidara, Pain, Madara Uchiha.
Tools that boost the kit
Sensei of Team 7: after chapter 1 if it's your team, otherwise with the Bell Test when you have all their genin