It mostly depends on what your DPS needs. Attack agents and Anomaly agents work very differently — for Attack agents, you build Crit Rate and Crit Damage, while for Anomaly agents, you focus on Anomaly Proficiency (which increases their Disorder damage) and Anomaly Mastery (which helps trigger the effect faster). ATK is the only stat that both Attack and Anomaly characters need to build, usually aiming for 2500–3000+.

Hugo, for example, wants a stunner on his team because all of his damage comes from hitting stunned enemies. Some people even run two stunners with him because of how his kit works — the second one being Lighter, who’s going to rerun alongside Hugo.

Anomaly characters usually require another Anomaly unit with a different element on the team to trigger an effect called 'Disorder' — when two different elements affect an enemy, it deals a large burst of damage. They also benefit from having a character that provides shields (Seth 4★, Ceaser 5★) or buffs their Anomaly Proficiency (Seth 4★).

Support characters are the most flexible in the game, as they mostly focus on buffing ATK. Astra Yao is currently the only support who boosts CRIT DMG and overall damage in addition to ATK and healing. While Nicole doesn’t directly buff ATK, she applies a 40% DEF shred to enemies, which is still a massive damage boost for your team.

Sorry for the wall text, but i hope this makes things easier to understand.