I'm not fluent in Japanese, but after all these years, I've picked up some stuff. And man, do they say these words and phrases a lot!

Mazaka - It can't be

Sonna - No way

Honto ka - Really

Yatsura/Yasura - These guys

Omaika/Omaieka - You huh

Bakana - Impossible

Sokowa - Over there/There

Zutto - Forever

Dochika - Which way

Nozomu tokoroda - Bring it on

Susume - Forward/March/Advance

Owarika - Is it over?

Dakara - Because

Shinzou ga - My heart

Hazukashi - Embarrassed

Kochika - This way

Ute - Fire/Shoot

Shoko - Proof

Koko - Here

Dame - Nooo

Issha - Doctor

Sensei - Teacher/Doctor

Bakuhatsu - Explosion

Kage - Shadow

Tate - Stand up

Daijobu ka - Are you okay

Tatakae - Fight

Karada - Body

Dareda - Who is that?

Otoko - Man

Onna - Woman

Kareshi - Boyfriend

Kanojo - Girlfriend

Yamero - Stop

Dateto - Date

Koi/Ai - Love

Kairu - Go home/I'm going home

Idarou - Very well

Mendokusei - What a pain/What a drag

Kanpeki - Perfect

Nondemonai - Nothing

Gokaide - Misunderstanding

Onegai - Please

Gokigenyo - Good day

Omoshiroi - Interesting

Subarashi - Excellent