Answer:
willpower and devotion
Step-by-step explanation:
The two characteristics mentioned by the anthem are willpower and devotion. These are mentioned by the following two lines from within the anthem itself.
Tus ganas de vencer - Your willingness to win!
Llevo tu camiseta, Pegada al corazon - I wear your shirt, Right next to my heart!
The first sentence mentions the players willpower to go against all odds and try to come out victorious. While the second sentence demonstrates the love and devotion that they have to the team, always carrying the team in their hearts.