• "-san" is the go-to honorific in unfamiliar situations, it basically the Japanese equivalent of "Miss" or "Mister". Used to show politeness and respect, it is used with people at the same social station, level or class as you and when you need to be polite. Is best used in conjunction with the person's last name, example being, "Kunazumi-san".
• "-chan" is the honorific used on the end of people's names to show affection or attachment to someone, usually a female, friend or lover. It's basically the same as calling, "Timothy" as "Timmy". It can be rude however to do so with people you've just met as it is rather intimate. It's also used in conjunction with nicknames for example, "Kuyu-chan", "Lila-chan", "Sumiko-chan" or even "Theo-chan".
• "-kun" is generally used with boys but can be used with anyone with a lower socal status or lower power than you. When used with peers, it's generally a case of familiarity and endearment. When addressing someone of a lower status, its used to avoid the intimacy or inappropriateness of using "-chan", where it may be deemed so, such as a teacher talking to a student. Example being, "David-kun", "Kikuyu-kun" and "Theodora-kun".
• "-sama" is basically the equivalent of "Master/Mistress" and are used to people who are of much, much, higher status then you. It's used to show just how much respect you have for the person your addressing and also sometimes used to address customers of a buisness. Example being, "Lilacflour-sama".
• "-senpai" is basically "senior". You use it to address people who have more experience than you but not by too much, such as upperclassmen in your high school or in the bakery's case, people who have worked here before you. Example is calling the twins by, "Kunazumi-senpai" as they are the very first two employees.

It'll be fine Chaotix. I would prefer if he did use some Japanese in his speech though. Perhaps the occasional, "Ohayou!" or something to that effect.

Also I've been pretty busy sorry guys.