I agree with Remny. It all depends on how you use it. I did visit there, and the animals are cute.
If it is used by anyone to promote paganism, such as gods and goddesses, or anything that denies Christ, or makes Christ equal to the gods of other religions, that is wrong and sinful.
If you use it to promote Christianity, or Jesus Christ, and not any other religion or spiritual belief system, then that would be permissible.
Many cartoon fantasy characters are used at CF, but they all promote Jesus Christ as the one and only true God, the Son of God, and One of the Three consisting of the Holy Trinity of Father, Son, and Holy Spirit.
If any cartoon character was used to deny Christ, or promote paganism, here at Christian Forums, it would get complaints, and even if there were no complaints, the moment the Moderators found out, it would be immediately deleted and the person who posted it given an unofficial or official warning.
If the same cartoon character was shown holding or bearing a cross and displaying a message like, 'Jesus loves you', it would be acceptable.
If the same cartoon character was shown bearing a cross, and displaying instead, a message like, 'Jesus loves you and so does Budda', or 'Jesus and Mohammed both love you', then that is making Jesus Christ merely equal to other religions and their deities or gods, and it would be totally wrong and also deleted, and the person who posted it given an unofficial or official warning.