A canon character gets transported to another world/universe/dimension.

The universe can be an original one or one that already exists, from any realm of fiction. That includes worlds where magic exists.

If the character who is transported is a team member, their transformation does not have to work, provided that there is a reason other than that they are not on their homeworld.

The common mistake of a good guy thinking another good guy is a bad guy and having a fight must not appear.

The character must be headed or at home by the last paragraph.

It cannot be just a dream.