- Before she was sent away at five, she had started to notice Endeavor's hostility towards her, and just felt a negative energy towards her that slowly grew and she didn't know why. Once while she was outside with Toya, Fuyumi, and Natsuo she overheard Endeavor tell Rei that she's always distracting Shoto from "what's important" and that she wasn't supposed to be over at their house anymore because all Shoto wanted to do while she was there is play with his best friend instead of the hero training.
She didn't know what he meant while he said it, but she could tell by how he said it that he didn't like her around and she didn't want to cause trouble. So she would ask Toya if they could be at her house so that she wouldn't be around Endeavor and cause Miss Rei trouble, because she thought that she was getting Rei in trouble by being there.

- At first she didn't fully believe it. Especially since Toya told her that it wasn't true, that she wasn't bothering anybody and wasn't causing trouble. But once she got older, and more and more people started to tell her that she was always bothering and causing trouble, she thought back to what she heard the Number 2 hero say about her and it's been on repeat since then.

- Once when her adoptive Mom at the time, told Toya that when she got home, that Natsumi told her all about her day with him and she told him that she said that "Toy-Toy is my favorite!".

- When she was three years old and Toya was watching her, she convinced him to play "tea party" with her. Fuyumi ended up talking him into doing it, but he had some fun and she used Fuyumi's play tea set. She would go out of the room and get water that was pretend tea and Toya drank it no problem. He drank about twenty little cups of this "tea" and he was wearing a tiny tiara and everything. When Rei came to see what they were doing, she noticed that there was water in the cup and she told him "Toya, Summer can't reach the sink. Where is she getting the "tea" from?" His face went white and he looked at the blue haired goofball and asked "Summer, where have you been getting this tea from?" She proceeded to walk over there, took his hand and led him to the bathroom and pointed at the toilet. The innocence on her face said that she wasn't meaning to cause mischief or anything, she saw nothing wrong with it. Toya wasn't that upset, he was just more appalled that he just drank toilet water that he was pretending to be tea. Natsuo and Fuyumi thought it was hilarious.

- She often did things that messed with Toya while he watched her, but the funny part is she didn't even mean to mess with him.

- Another time is when Toya was picking her up from school so they can hangout. He was speeding and he sped by a stop sign. He thought he got away with it, but there was a cop car that was hiding somewhere and it wasn't long before they heard the sirens in the back. Summer asked "What you do Toya?" And she tried to look behind her to see if she could see the police car. She saw the police officer come to the driver's side window where Toya was and he asked him after he saw her in the backseat. "Babysitting job?" Since he seemed to be a pretty decent kid, and there were teenagers who babysat kids all the time. Before Toya could defend himself, Summer spoke up. "Hmm. That's not the first time. Toy-Toy got pulled over just last week for the same thing. He is not very good at stopping." Before Toy-Toy could say anything, the officer was at her window already. The exchange consists of "Oh, so he does this a lot does he?" and "Yeah, he never stops at stop signs." He then told Natsumi to continue her vigilance and make sure that he stopped at stop signs. He was released with a warning, on the condition that he listened to his new backseat driver.

- Once while she was still with her biological mother at two, she had recently been fully potty trained. So when she told her momma that she needed to go to the bathroom, they went to a gas station to use the restroom and she was taken to one of the stalls. When she started doing her business there was a lady that went to the stall next to them and Natsumi asked if she was also going potty and she said yes. When the lady flushed and was done, she clapped loudly and shouted "You went potty all by yourself! Good job. lady!"

- Since Toya grew up with Keigo Takami (Hawks), she's seen him a few times while Toya babysat her. He'd be at her house sometimes and she got along with him really well. On her third birthday Keigo got her a dollhouse that he made himself. It was kind of silly, but she loved it!

- She remembers him slightly from her childhood, she does remember his name but she doesn't going around saying that she was around Keigo during the time she was two and a half to five since why would she? Plus, she didn't even know if he remembered her or not.

- She knew that he remembered her when he called her "Summer" though. It was a dead give away since pretty much only the Todorokis called her by her nickname, and it started when she was really little.

- While she was at an institution after her explosive episode, she had written letters to Toya that she kept. It helped her to get through the three weeks she was there to write to someone that she found comfort in the past and she remembered how much fun they had. It was in these letters that she was honest about how she had been feeling, and it helped her get better.

- She has a box of those letters still that she refuses to part with, since it got her through those three weeks of what felt like forever.

- It was when she heard that Toya died that the guilt of not doing enough started building up inside of her. She thought she didn't do enough, and it was her fault that he died because she didn't try hard enough to tell people that there was bad things happening in that household.

- The second time when she attempted suicide and was put in an institution, she learned to make pop up flower cards, and it made the time go by she had fun doing it. She doesn't make them for anyone specific other than to keep herself busy.

- At ten she started experimenting with her slime quirk to see what combinations she could get and what they did and she started to teach herself more about her quirk and how she can make it useful.

- Her birth surname is "Aokigahara", but the first family that adopted her's last name was "Aishi" and she had good memories associated with that last name, with her birth last name, the only memories she has is false hope. So, she prefers to keep her legal surname as "Aishi" for the time being.

- She used to be very organized with her stuff. Everything had a place, and she always kept them in that place. She was kind of secretly messy, where her clothes drawers were a disaster but when you look around the rest of the room it's neat.

- When she turned nine though, she stopped trying to be organized with her stuff since she was always moving everywhere all the time, so she gave up on being neat and by the time she was eleven, she didn't care.