Custard is a six year old hyper kid. Let alone having alot of trauma for his age, he is normally very bright and cheerful (and loud). It's normally late night star jellies that trigger his system.
He's very enthusiastic about being a king, and can get very bossy sometimes, going around on his 'kingly' duties. He's very clingy and will never deny a hug. Being very short tempered, it's always nice to have a friend of him by his side to calm him down a bit, especially if he's stressed. He normally just wants the best for the people around him, and will try to act very grown up if anyones upset/hurt. He also sees himself as inspiring, giving random and useless speeches to anyone he can at any appropriate moment. (Sometimes he even will just say it when everyone's dying for goodness sake)
If you have anymore genuine questions about custard, please tell me.