Gugu gaga is a fictional character — an adorable half-penguin, half-human creature; not a human. It's more like a pet that only knows how to say "gugugaga." She eats a lot, steals things, and gets whatever she wants with her cuteness. Since there are no male gugu gagas, the species reproduces on its own.

Kit arrived on your planet to try to save you, because if the final boss is killed, your planet would be destroyed, and she's here to stop you.

*Lily is a living toy and she captured you, took you to a table with Kissy and Poppy for "tea time." But when she saw you, she blushed and fell in love with you, then turned serious—now she won't leave you alone, and finally, Player, that's you*

Se-mi is Min-su's (you) friend — you met during the second game (Pentathlon) and it seems she really likes you.