(ц｀ω´ц*) This wound up being kind of a behavior analysis. Also sad. It wound up being really, really sad. 

Shuu:

-His behavior is split between that of a cheerful, relatively normal kid, and a desperate, near panicky need to avoid any kind of restriction or punishment. Shuu will accept you rather quickly, but he always seems to be sort of anticipating everything going horribly wrong, you starting to control him just like his mother did. He does tend to start fights, especially with Reiji, but it’s more insensitivity than intentionally doing anything wrong. 

Reiji:

-He’s a well behaved child, but in a way that feels more like he’s afraid of what will happen if he isn’t. Reiji quiet and out of the way, more often studying by himself than trying to get your attention, but it’s obvious that he’s trying way too hard to be grown up. Reiji doesn’t quite act like a child, even at such a young age, and he’ll do everything possible to be self-sufficient and responsible, even as it’s obvious that he’s starved for any kind of praise. 

Ayato:

-Ayato is honestly one of the most difficult kids you can deal with. He’s hyperactive, disobedient, and does whatever he wants whenever he wants to. However, any threat of punishment makes him nearly break down, so you’re left walking a delicate balance between keeping him under control and worsening his trauma. He’s the kind of kid to get into trouble constantly, and rarely a day goes by without him doing something he shouldn’t.

Kanato:

-If he’s attached to you, Kanato is the neediest child you may ever encounter. He’s so starved for affection that he’ll happily hurt himself just to get you to take care of him, or scream his throat raw until you pay attention to him. While he’s generally a reserved child, he doesn’t now how handle social interaction, and throws huge fits when the other children do anything that upsets him. He’s painfully clingy, and almost worryingly withdrawn. 

Laito:

-He acts like a normal kid, but it’s a very intentionally crafted ruse. Laito will do whatever he has to to appear well-adjusted, and puts on a front of being cheery, obedient, and innocent. He’s surprisingly responsible, and is decent at managing the other triplets. However, the closer to him you get, the worse things you’re going to find. Deep inside, his emotional state is a disaster, and he’s perpetually terrified of your kindness not lasting.  

Subaru:

-It’s hard to find a place to start. Subaru is a dangerous mix of a hot, violent temper, vicious self-hate, and a terrified longing to have a stable parental figure in his life. He’s downright reclusive, never interacts with the other kids, and reacts with violence when anyone but you gets close to him. He’s visibly terrified of the slightest negative reaction from you, and is so full of self-loathing that he can barely handle any positive responses. 

Ruki:

-He’s a polite, almost stern sort of child, and it’s obvious that he’s been forced to grow up way too soon. Ruki is almost more like a second parent when it comes to his brothers, and rarely causes any kind of trouble. He doesn’t take to authority well, though, and while he rarely does anything that needs corrected, he doesn’t like having to obey you. He’s viciously protective of his brothers, and tends to assume the worst of adults like you.

Kou:

-Kou is split between a broken, petrified mess who will break down into tears if you so much as raise your voice, and a clingy, needy child who soaks up every bit of affection like a little sponge. He’ll latch onto you if you let him, but at the same time, he’s constantly terrified that you’re going to turn out just like the last adults he knew. He’s a bit of a troublemaker when he’s relaxed, but he’s far too afraid of punishment to do anything too out of line. 

Yuuma:

-He doesn’t like being told what to do, and is entirely used to living without any kind of adult to rein him in. Yuuma is an excitable sort who tends to be rough, often unintentionally, and he’s more than willing to run off on his own and get into all kinds of trouble. He’s really, really not good at decent indoor behavior. He’ll demand to be punished in his brothers’ place, though, and it feels sort of like he’s trying to keep any negative attention away from them. 

Azusa:

-Aside from wanting you to hurt him, he’s a fairly well behaved child. Azusa is quiet and slow enough that he’s not good at causing trouble, and he’s more likely to be lost in his own little world. He’ll worship the ground you walk on if you’re kind to him, but unfortunately, that just leads to him wanting to be hurt all the more. Azusa does have a bit of mischievous streak, and he’s just plain demanding when he’s set on something that he wants.

Carla:

-Carla is so well-behaved that it’s almost scary. He’s more proper than most adults, unnaturally reserved, and seems to be downright frightened of the consequences of showing any genuine emotion. He’s a shy, soft child deep down, but it’s hidden under layers of stoic self-restraint. He’ll accept your authority surprisingly quickly, almost like he doesn’t know what to do without someone in charge. He always seems to expect to be hurt by you.

Shin:

-He’s a nightmare of a child. Shin never stops moving, is more than willing to bite people that annoy him, picks constant fights with anyone who gets too close, and resents you trying to control him. He’ll only listen to Carla, and even though you can kind of tell that he’s really, really desperate for praise and attention, he’s so ungrateful that it’s hard to give it to him. If you get on his good side, he’ll defend you to the death… but that’s far from easy.