As of the end of November 2014, No one has any idea what Butch Hartman is planning for Season Ten.
Unknown. On August 18th 2015, it was announced The Fairly OddParents was renewed for a 13 episode Season 10. Air dates are TBA, but it's certainly possible one or both will appear in Season 10.
No. Missy was a one shot character.
No, she only appeared in one episode.
No, she only appeared in one episode.
As of February 15th 2015, The Fairly Beginning & Fairly Old Parent have not aired (in the U.S.) but Man's Worst Friend has & neither Trixie nor Tootie appeared in it, although according to the FairlyOddParentsWikia, they do not appear in the unaired episodes either.
Trixie Tan does appear in the Fairly Oddparents episode Finding Emo, along with Tinny, Cosmo, Wanda, and Poof.
Trixie.
As of November 12, 2013 the information on the Fairly Oddparents episode "Finding Emo" is limited. Who will appear in this episode has not yet been detailed.
Trixie Tang.Although, since the movie "A Fairly Odd movie: Grow up Timmy Turner!" was made it is evident in this movie that he is actually in love with Tootie.
She returned to normal forgetting everything that happened while she was affected by the rule free wishing.
Love Struck
Nothing "happened" to her. The writers just decided not to focus on her character in later episodes so she was essentially written out but she does show up on occasion.