You know two of them. But here's all 3 of the heroes.

(Left to right)
Emerald (the strongest human)
Nitsua Llevol (Green and Purple Haired Saiyan)
Majin Chara (the Lost Majin)

Emerald's Broad Z Sword in the background and a couple of dandelions.

The dbz Z with the 1 star ball

The other symbol is mine.

My signature has 3 auras. Can you guess who's are who's?