Synopsis: Touma and Reiko accidentally fall into another world where a war rages across the earth. Reiko is taken prisoner by one side, and Touma is enlisted by the other. Both must cope with the realities of their new life, try and find a way to bring themselves home together, and above all, keep their spirits from breaking under the weight of war.
Boring but Practical: Most of Touma's abilities fall under this. He doesn't wield flashy Sekirei powers, complicated magecraft, or terrifying Noble Phantasms, but given the right tools and a bit of time, he can be more dangerous on the battlefield than most of his siblings.
The Brigadier: Captain Varrot fills this role, since most of the high command are non entity assholes.
Falling Into Command: Touma is given command over a third of the squad as a platoon leader before they head off into combat. Subverted in that he actually has combat experience and training thanks to his siblings.
Fantastic Racism: Prevalent against Darcsens. Touma's unwillingness to listen to it is what endears him to them.
Sleepwalking: Touma is such a heavy sleeper that one time, he walks around the training field, then back to the barracks and no one knows. And how does his squadmates find out? For the male, it's the case mentionned above. For the female, Touma snucks into their room, climb up and hugged Marina.