Grace Howard Best Team Compositions and Character Synergies

One of your strongest Support Agents is Ukinami Yuzuha, as Additional Ability: The More the Merrier buffs general Anomaly stats and Disorder DMG. Whether you want a mono Electric or Disorder team, she provides the most squad flexibility for Grace.

If you are looking to build a mono Electric team, Alexandrina Sebastiane is your next best Support Agent for Grace. Her Additional Ability: Banquet of Perfection increases both the Shock duration on enemies, as well as everyone's Electric DMG bonus. As Grace's Core Skills both focus on increasing Electric and Shock DMG, including Alexandrina Sebastiane is very beneficial.

Alternatively, any Support Agents who can provide ATK buffs will also work well with Grace. For example, Astra Yao's Core Passive: "Graceful Andante" or Lucy's Cheer On!. You can also go with Nicole Demara for her Core Passive: Mechanical Case, or Soukaku if you include an Ice Anomaly Agent.
Many of these Support Agents also work well in a dual Support team, so consider if there are no other suitable Anomaly Agents available.

If players prefer more survivability, Agents such as Caesar King and Seth Lowell can also increase the squad's ATK via shields.

If players want to use Grace in a Disorder team, she should be paired with Anomaly Agents who are not Electric. Thanks to Pulse, Fire and Ether Anomaly Agents have the highest Abloom DMG multipliers.
Additionally, Agents like Vivian and Burnice White are very compatible with Grace, as they do not need a lot of field uptime to deal DMG. If you have stronger Anomaly Agents available, such as Hoshimi Miyabi or Jane Doe, sharing field uptime might be difficult but very rewarding.