Yin and yang

Yin and Yang are Twins

Counterparts (Ying)

 * Bill (Thomas the Tank Engine and Friends)
 * Zug (TUGS)
 * ¿ (Construction Site)
 * Nuru (Bionicle)
 * Percussionist (Harror the Robot)
 * Lemmy hip Koopa (Super Mario Bros)

Counterparts (Yang)

 * Ben (Thomas and Friends)
 * Zip (TUGS)
 * ? (Construction Site)
 * Entorek (Bionicle)
 * Pianist (Harror the Robot)
 * Iggy hop Koopa (Super Mario Bros)