Hanabi 「花火」

This is the group that covers Morning Musume songs.

Junketsu 「純潔」

This is the group that covers Berryz Koubou and C-ute.

Sankaku 「三角」

This is the group that covers H!P groups with 3 members, which includes Buono!, v-u-den, Pucchimoni, Milky Way, and Aa!

Houkei 「方形」

This is the group that covers H!P groups with 4 members, which includes Melon Kinenbi, Guardians 4, Shugo Chara, S/mileage, Tanpopo, and Mini Moni.

Amari 「余り」

This is the group that covers the remainder of the H!P groups and misc H!P songs. Examples include High-King, Shuffles, and ZYX.

Vocamotion

This is the group that does Vocaloid songs without the auto-tune.