Extremely serious and with a no-nonsense personality, all while being in charge with protecting the royal family, it is no surprise that Frederick is a natural skeptic, a fact very aptly encapsulated by the nickname "Frederick the Wary" given to him by Chrom. He is also known to be very patient, dealing with Lissa's antics and Chrom's reckless behavior without displaying any visible signs of resentment. Despite this, it is clear that Frederick deeply cares for Chrom, Lissa, and Emmeryn, feeling the need to protect and serve them at all costs.