Amongst her subordinates, Tanith has a reputation of being a strict and fearful officer, which has earned her the nickname "Great Demon". Alongside Sigrun, she spends her life guarding the Empress. This strictness of Tanith's may be observed in her support conversations with Marcia, where she expresses irate anger towards her defection from the Falcon Knight squad.
It is later revealed that this strictness of Tanith's is nothing more than a means with which she employs in order to express her concern for her comrades, as can be observed in her A rank support conversation with Marcia, where she admits that has faith in her becoming a part of the Empress' Holy Guard.
In her support conversations with Oscar, it is revealed that Tanith's culinary skills are dreadful, with her cooking having successfully "taken three of the academy's finest generals out of action for nearly a month." In their A support, Oscar promises to teach her how to cook.