Elemental attributes affect team composition and character customization as an additional factor to optimize combat performance. The focus is on gaining advantages in attack power and skill efficiency rather than being the primary condition for character selection. Key details from sources are as follows:

• 5% Power Bonus: Every character has an elemental attribute. If you equip an ability that matches the character's element, you will receive an extra 5% power bonus when using that ability.
• Skill Optimization (Elemental Affinity): Some characters have higher affinity with certain elements. Using abilities of these elements results in stronger or more impactful effects.
• Impact on Loadout: At high-level play, it is recommended to choose skills that match the character's element to maximize damage. For example, when playing Gaia, select water-element abilities to gain additional power bonuses.
• Importance Compared to Other Factors: While elemental attributes help, factors with a greater impact on team composition are role balance (Melee, Ranged, Agile, Support) to handle boss mechanics and control the battlefield effectively, along with selecting UR-level abilities which provide significantly higher base stat modifiers.

In summary: Elemental attributes are mainly for fine-tuning your characters to maximize their performance with the chosen skill loadout. When building your team initially, prioritize role balance and skill rarity (UR) first, then use elemental advantages to further enhance power.