Osprey

Ikeda is a pretty young regressor, usually to around toddler age. He has a sort of oral fixation (biting and putting anything he can into his mouth to chew on) for which he got chewlery and later on also a pacifier!

He's embarassed about it when hes big , but small him loves plushies, toys, pacifiers, sippy cups and bottles. It kind of takes a little warming up, but it brings him a lot of comfort.

I strongly believe in the mama tei headcanon. He sees tei as his mama , though doesn't actually call him that unless very small. Ruka switches between being a big sister and also a mother figure depending on how young he regresses.

I headcanon Ikeda actually being selectively mute , specifically when he's regressed. He has a hard time talking and mostly communicates through non-verbal cues. He isn't much of a talker or babbler and in general is very low energy!

His favorite activities areee... naptime. Or drawing! His passion is drawing and he always shows his creations to tei and ruka , who praise him lots for it. Even when he's small he's still quite talented.

Hirose acts as a babysitter when Ruka or tei aren't around. It took a bit for Daiki to trust him, but he learned that hirose was more scared of him and he is of hirose (/silly). Though if very small and apart too long he starts crying for tei.

When he regresses older , to 8-10 (which is very rare) , he still has his streak of being insufferable, but in a more genuinely joking way. He tends to tease people in a more light-hearted way, but he doesn't genuinely insult them or try to hurt them in a significant way.

He rarely regresses older because a lot of the times it comes with memories of his past. Luckily with Tei there it's easier, but a lot of the time he regresses to toddler age , where he hasn't been hurt and felt safe and warm.

Him and denden are playmates!! Denden is a permaregressor , and as stated before , instictively acts as a older sister to people who regress younger than her. She enjoys playing with daiki a lot! They usually draw togheter , but also play games together if he has enough energy.

Would technically get along with a lot of other regressors, but i believe he enjoys solitude with his main cgs a lot more. Playing with sou , erina or denden is fun but very tiring, and especially when he's very young he gets sleepy easily. Being tired or hungry tends to make him cranky and upset, or causes him to panic a little.

Sou is also one of his babysitters! Not as often , but definetly more often than Hirose. They also act as playmates and regress together sometimes. Sou has a way of understanding daiki , even without much sight or words, bad is a very comforting presence for him <3

— Afterwords

Most commonly regresses after having intense emotional episodes / breakdowns , which she used to handle alone before mutsuko and sou became her friends. I think they found out about her regression through caring for her after a particularly harsh breakdown.

Her favorite activities are watching stuff, playing with legos / building toys and playing video games.

Has infrequent playdates with sou , and even with ikeda! She regresses older than ikeda and tends to act as an annoying older sister to him. She might steal his toys or something like that , but in the end she's never too mean , and they can still have fun togheter!

Biiiigg tantrum thrower , no matter what age, but ESPECIALLY when shes very small. Stomps her feet on the ground and may even throw herself on the ground if she's upset enough , and pulls on her hair.

^ Sou and Mutsuko worry a lot about her hurting herself during her tantrums, preffering to keep her on soft grounds just incase.

Mutsuko is her big sis! Can tend to get rather harsh with Erina, but in the end obviously just wants the best for her and is an incredibly comforting presence. Her way of connecting with Erina is cooking with her and teaching her how to make stuff , or playing games with her. When Erina has tantrums tries her best to guide her somewhere soft and keep erina in her arms until she calmed down, usually laying down to take a nap togheter. VERY insistent on naptime! Erina needs it after big emotions!

Sou doesn't really have a specific category of caregiver he falls into , kumada refers to him as "yaita" or just simply sou. He likes to spend time with erina by watching her do her own stuff and talking to eachother , or more frequently setting her down to nap / let her sleep on him while he draws

When on playdates with Ikeda , Tei tends to act as a babysitter for her too. She's a bit akward on how to handle Kumada throwing a tantrum , but is a natural at handling all kinds of children.

She knows she's not much of a caregiver , and does NOT know how to handle caring for children , but does an suprisingly okay job at it. Children flock to people who act chill and treat them like normal humans , and that's what she does. Her style of babysitting consists of being near the little and taking a passive interest in what they're doing , mostly making sure they don't hurt themselves or anything like that.

— Afterwords!

I headcanon Denden as a permaregressor, specifically between 7-13. She can regress younger than that, but that's usually due to vent regression (a.k.a during extremely stressful situations

VERY big on playdates. Usually with ikeda! But she loves playdates with anybody whos willing.

Her favorite activity while regressed is drawing, planning out ideas for her ice sculptures, playing in the snow (during the winter), and sometimes even working on mini ice sculptures! She enjoys holding it up to people to praise or gifting it to others to make them happy

Denden naturally acts as a sort of "big sister" caregiver for littles she has playdates with! She's older than them a lot of the time, and she just likes to hangout with them!! She has a very comforting aura + gives great snuggles <33

Biiigg sweetheart.. i would say she acts pretty much how she does in the series already. She struggles understanding some topics , she still has the smarts of an adult but internally she feels like a child (due to permaregression), and she has no shame in expressing that.

Enjoys learning about all kinds of stuff and is a pretty curious kid. She especially loves it when isoda hums stuff to her and when hirose , isoda and her hangout togheter.

Always urges Hirose to take a break , especially to let go and indulge in playing with her a bit. The trio like to play games togheter, usually some kind of card or board game they have laying around. It's a good way to get hirose to relax while all having fun togheter.

Usually Isoda is the one to comfort her when she's upset. She tends to be more emotional and take things at face value , so she can get whiny or sad over a lot of things. Her usual way of dealing with it is cuddling up with isoda and letting them hum something to her and talk it out a little. She always feels way better afterwards and bounces back pretty easily!

She does struggle a lot in her daily life, but luckily she's still able to do her job (ice sculptor) just fine even when she's feeling small. I think Hirose and her would live togheter , or atleast very close near eachother. Hirose cares for her a lot , and often comes to check up on her or just supervise a bit.

— i hope these are okay , i always have a lot of thoughts once i really get into it.