Itsuka Kotori

The best imouto with two personalities in the huge Date A Live series is Itsuka Kotori. She looks like Shido's sweet little sister on the outside. But she's really the smart leader of the secret group Ratatoskr and a Spirit with a lot of power. It's funny to watch her plan her brother's stupid dating missions from a silly floating airship all the time. She is a strict boss, but she also really cares about her family's safety above all else. She literally has to carry the whole story on her tiny shoulders.

Kotori is a top-tier waifu who really knows how to do the tsundere look. She has long, beautiful red hair in twin tails and bright red eyes. Her ribbon switch is her best trick. She acts like a sweet, helpless little sister who can't get away from her onii-chan when she wears white ribbons. But when she wears black ribbons, she becomes a cruel, foul-mouthed commander. This amazing gap moe drives fans completely crazy. She wears a sharp military jacket and always has a lollipop in her mouth. Also, when she becomes her fiery Spirit form and wears a beautiful red kimono and swings her huge flaming halberd, she becomes even cooler.

Kotori wallpapers are great because they come in three completely different styles. Artists love to draw her looking totally badass in her fiery Efreet dress while holding her huge, blazing weapon. There are also a lot of cute fanart of her sitting in her commander's chair and eating her favorite lollipop. A Kotori wallpaper is exactly what you need if you want a background that perfectly shows off bossy tsundere energy and cool fiery looks.