{
"Aatrox": {
    "version": "5.2.1",
    "id": "Aatrox",
    "key": "266",
    "name": "Aatrox",
    "title": "the Darkin Blade"
},
"Ahri": {
    "version": "5.2.1",
    "id": "Ahri",
    "key": "103",
    "name": "Ahri",
    "title": "the Nine-Tailed Fox"
},
"Akali": {
    "version": "5.2.1",
    "id": "Akali",
    "key": "84",
    "name": "Akali",
    "title": "the Fist of Shadow"
}
}

public class CampeonBO {

private String version;
private String id;
private String key;
private String name;
private String title;


//Getters and Setters
}

Type type = new TypeToken<List<CampeonBO>>(){}.getType();
List<CampeonBO> campeones = gson.fromJson(bufferedReader, type);