Nephilim

Nephillim are a possible species that both heaven and hell fear. Nephillim are Hybrids there are three possible Hybrids the two sides fear these hybrids so much beacuse it is said that a hybrid of any 3 kind will be stronger then both species.
 * Half Angel Half Human
 * Half Demon Half Human
 * Half Angel Half Demon

as both angels and demons can take human form it is possible that these hybrids could exsist

Powers and Abilities
the powers and abilities are unknown as the species itself may not exsist

Both angels and demons see this potenial species as abomonations