Where is Mellow?

I found this pretty cute room. I fall in love with all this brummagem cute things ≧(´▽｀)≦ I HAVE TO do a picture w


Who is the true Mellow?

よくできました！
This word my sensei wrote under my test, I don't know the meaning.
But I think the meaning is good job XDD or something like this.

よかった！
I hope this world is OK ww

Here I am. (・∀・)

それ　ではまた。(●´ω｀●)ゞ