Severian Best Team Compositions and Character Synergies

• Norma is probably going to be one of Severian Lowell's best Stun Agents, as she can stun enemies from off-field, allowing Severian to stay on-field more often, and provides DMG buffs. Norma can also provide frequent Quick Assists that transform into Chain Attacks, allowing Severian to not only deal more DMG, but also accumulate more resources.
• Dialyn is a consistently great Stun Agent for Attack Agents, and that should also be the case with Severian Lowell. Dialyn can provide fast stuns, large DMG buffs outside of Stun, and even an additional Ultimate.
• Other Stun Agents, especially off-field Stun Agents such as Trigger or Ju Fufu, can also be great options, providing out-of-stun buffs and also allowing Severian to stay on-field more often.

Support Agents who can provide large ATK or PEN buffs for a consistent duration can be decent options to pair with Severian Lowell. Other Support Agents, such as Nicole Demara, might be usable as well, although the short uptime on Nicole's buffs might not be as effective.

If Severian Lowell is already paired with a Stun Agent to trigger his Additional Ability, you could also use a Defense Agent to provide useful buffs to Severian, such as Zhao or Caesar King's ATK buff. However, these Defense Agents often provide fewer buffs than other Support Agents.

Roxy might seem like a decent Stun Agent to pair with Severian Lowell as both are Wind, however that works to her disadvantage. Severian can already build up decent Wind Attribute Anomaly and would instead prefer a Stun Agent of a different Attribute to trigger the Contamination effect. Instead, Roxy can still be used for her CRIT DMG buffs.