 If you liked Fate/stay night |  ...then you might like Toaru Majutsu no Index |
The protagonists Shiro and Touma are both all about protecting and saving others regardless of any consequences. They both have limited amount of power but somehow manage to survive many fights against most powerful villains. The character constellation in terms of romances is quite the same, the protagonist is living with his main female compagnion and has another tsundere-type love interest which is more loosely connected.
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Both are basing on magic, supernatural powers and fights. Characters of protagonists are identical: Shirou is similar to Touma, because both of them wish to protect all people despite of everything; Rin and Misaka are both tsundere.
Touma and Shirou are "normal" boys that have a sudden encounter with a girl and are dragged in a world filled with magic and battle. Both Touma and Shirou have similar personalities and will try to save as many humans as possible even if they have to risk their own lives; but luckily no matter how strong their opponent is, they always manage to survive.
- Both have magicians - "Normal" Heroic and selfless main characters practically useless but with an especial/unique usefull hability. - Talented tsundere girl as partner. - Protects and is protected by a strange girl not very used to modern world. - Childish teacher-mommy
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