Haniva is Hanna
When Klaus and his mother returned to the room, he noticed that Danny and his other male friends were not there. This made him smile slightly. Clearly, his friends were men of culture. He looked around the room, his smile lingering. Then his eyes landed on Hanna.
As soon as they did, memories of a young woman who had ignited her soul to buy time for his mother and him when they were being chased by the ten masked figures flooded back. That young woman looked just like Hanna, though a bit more mature.
But she still looked like Hanna. In his memories as Fruity, he learned that this woman had been his mother's close friend, protector, and even his babysitter. They had been very close.