Meat shield heroes: as an ADC, the little sister's blood is less than brittle, it is easy to be killed by the other side of the set fire, so you need to match the meat shield heroes to protect her, to provide her with a good output environment. The recommended heroes are orcs, bullheads or pandas.
Recommended reason: these heroes all have the characteristics of blood more thick skin, and their own have more than one control skills, you can control the enemy heroes in the group battle, for the little sister to provide a good output environment, so that she can rest assured that the output, and do not worry about their own harassment by the other side, was set on fire to kill.
Auxiliary heroes: We also need an auxiliary hero. Recommended to everyone Water Angel or Raphael. Water Angel skill can return blood, and with stun skill, big move can also provide shield, can provide close protection for the little sister.
Recommendation: Raphael agrees with the skill of blood return, and the big move can also control the enemy, to provide safe and intimate protection for the little sister, so that she does not have to be afraid of being assassin heroes close to the kill.
Output heroes: Finally, we need to give the little sister to provide more partners, together with the output. The recommended heroes are Sword Demon, Sky Dance or Elf Prince. Sword Demon and Sky Dance are basically similar, both belong to the sudden assassin heroes, in the group battle can instantly cut into the battlefield, the other side of the output bit directly killed, to prevent our heroes to be killed by them.
Reason for recommendation: while the Elf Prince, as an ADC, can share enough output for the little sister, so that the little sister will not be tired of output all the time.