Not intended to make my boyfriend sound like a science experiment, but are genuine reminders to myself, or things I have observed. Subject to change or notes may be added as time goes on.

Jack:
-Has nerve damage in his left eye from the childhood 'brick incident'. If that eye starts twitching (generally if he's stressed), rub the nerve above his eye until he calms down, it seems to make it stop.
-Jack wants to think that he is like his father and nothing at all like his mother. Has difficulty talking to her now since it's been since childhood that he's spoken to her (him personally). If I ever have questions about their father - ask Jack, don't ask someone who can be triggered into 'that' memory, but ask anyone other than Jack about their mother.

Johnny:
-Gets stressed easily, and if not convinced to come out and talk about it (or at least be comforted about it), will sit in his room and get drunk, eat everything in the house, or go out and eat fast food (which he shouldn't because they're on a diet).
-Johnny gets sick when he's in pain (headaches, etc), and will start gagging and practically throw up if not kept calm or treated quickly.
-Johnny also seems to be the sickest of everyone and has a higher likelihood of making the body sick than everyone else, even when there's nothing wrong.

Kiddo:
-Need to tread lightly with his asthma (which is worse than everyone else's), specifically because if strained too much Kiddo can be triggered into a childhood memory wherein he nearly suffocated, caught under a pile of snow with no one around.
-Kiddo should also be reminded to use their inhaler before switching out of possession, or it'll hit the next person to switch in hard enough to have an asthma attack.
-Also need to tread lightly around arguments - Kiddo can be triggered into flashbacks of his parents locking themselves in their room and screaming at each other in German so he can't understand them or reach them. If I need to argue with someone in the system, make sure Kiddo is far out of earshot, and NEVER yell at Kiddo himself.
-Not so much candy, but Kiddo likes sweet things like Lucky Charms cereal or ice cream. These tend to keep him happy or calm. Also tend to work as a reward when he's behaving.
-Kiddo will try to imitate the others' voices without my knowing as a prank - pay close attention to his breathing pattern, it's the only thing that gives him away.

Chibi:
-Is very hypersensitive to anything that is said to him. Unless it's something to the effect of, 'You are adorable.' or 'I love you.' the reaction will be a scared and defense, 'What does that mean?? You don't love me anymore??'
-Remind Kiddo to play with him everyone once and a while, he gets lonely.
-Chibi does not know about the existence of the core personality, Luke, living inside him. As such, asking, 'Can I speak to Luke?' does nothing. I've yet to discover how to draw Luke out in order to speak to him.
-Chibi has a tendency to call me 'mommy'. He wants and needs to be treated like an actual child, and not like Kiddo.

Luke:
-Encourage him to come out more often, he actually wants to experience life 'on the outside'.