Shinobu can do several things, answer your questions, ban/kick people, assign roles to people etc...
Here is a full list of what she does:
COMMANDS ANYONE CAN USE:
.nick your nickname : "Changes your nickname on this server"
.role your role : "Assigns the mentioned role"
.8ball your question? : "Answers your weirdest questions"
.avatar : "Sends a direct link to your avatar"
.ping : "Calculates and sends the bot's ping."
COMMANDS FOR ADMINS/MODS ONLY:
.kick @member : "kicks the mentioned user"
.ban @member : "bans the mentioned user"
.purge ### : "Deletes up to 100 messages."