Too many good quotes. Can't choose one.
Why? You can name multiple if You want.
Sakura: "In my planet, we all give mercy to those who need it. And you needed it more than ever." (Sakura in Gimael)
Takamina: "Back on Earth, we tend to let our imagination fly away and just explore our creativity." (How to NOT hunt a Geldrius)
Hayato: "I have nothing to lose!" (Hayato the Anstrutione)
Sakura: "You will become a King one day. I suggest you start acting like one." (Hayato the Anstrutione)
Sophia: "You're special, Earthling. My son needs a person that will guide him on the right path." (The Forest and the Dream)
Miyuki: "Every man who is destined to be great needs friends to support him." (Vanoran)
Hayato: "In Gimael, I was given the freedom of choice to be someone." (Usurpation of Power)
Rainoric: "YOU DON'T CALL ME......WEAK!" (Usurpation of Power)
Leoferic: "We shall be as swift as the Angels!" (Battle of Ydeli Plains)
Osgar: "Let's dance shall we? It cures hangovers." (Party hard and lobby soft)
Rainoric: "But can I do this? Just get my own box and think inside that?" (High Seas Attrition)
Ulrich: "Salty no more tears....Salty has friends...." (High Seas Attrition)
Sakura: "Because it was the right thing to do." (The Giant and the Storm)
Rainoric: "Use that mushy clump of muscle in your head called a brain and know what you want to be and are." (Down the Rabbit Hole)
Jurina: "DON'T LET HIM WIN. NO MORE DEATHS TODAY. NO MORE!" (A deathly air)
Rena: "This is for Jurina!" (A deathly air)
OK done!