However, all her in-game lines are about Lyon in her cav incarnation. Plus, she makes a really great team with L'Arachel. (So I had them Ally Support.) Tome!Eirika has a really potent offensive spread, so she makes a natural desperation raudrblade unit, while L'Arachel is a great Res tank with the power to counter-kill the enemy with a blarowl.

In fact, for the Tempest Trials, I put the two of them, plus Valentines!Lilina and Elise into a team to have a "Pretty Princess Pony Party", which was quite effective. (Elise bearing the double-savage dazzling pain+ build so as to lop off the health of anything with high res, since I had no physical or melee damage and no Def tanks.)