Twilight has 10 of the elements.
Peace - Dawn Bringer - Celestia
Hope - Morning Star - Luna
Faith - Oracle - Faust
Heroism - Dragons Soul - Spike
Kindness - Sirens Song - Fluttershy
Honesty - Bucking Bronco - Applejack
Loyalty - Wings of Liberty - Rainbow Dash
Laughter - Party Balloon - Pinkie
Generosity - Platinum Diamond - Rarity
Friendship - Arcane Crown - Twilight
Elements of Harmony- top halve (Elements of Hostility- Bottom halve)
Patience (Haste), Wisdom (Ignorance), Peace (War), Humbleness (Pride), Heroism(Wickedness), Generosity (Greed), Laughter (Stress), Friendship (Loneliness), Loyalty (Betrayal), Kindness (Cruelty), Honesty (Deceit), Protection (Danger), Hope (Despair), Faith (Doubt), Love (Fear), Forgiveness (Wrath), Tenacity (Laziness), Happiness (Sadness), Order (Chaos), Modesty (Vanity), Chastity (Lust), Luck (Misfortune), Life (Death), Courage (Coward), and Temperance(Gluttony).
To find a Hostility Element just look across from its positive, like a mirror is in the middle.
Example - Temperance(Green Leaf), and Gluttony (Strawberry) are opposites.
Honesty (Orange Apple) and Deceit (Green holed heart) are opposites.