A. Nice ones Zetsubou and Photon Torme.
B. I've been shying away from this because I hit my old stumbling block on this, the Titan/X-men thing. The Summers/Grey relationship is always the hardest for me, but I think I've got it:
13. Doom Patrol + Original X-men/X-Factor/X-terminators = X-Patrol
14. Teen Titans + New X-men = The Teen Mutants
15. Cheif + Angel = Head Angel
Negative Man + Ice Man = Negative Temperature Man
16. Robot Man II + Proefessor X = Professor Techs AKA Robot-X
17. Mento + Marvel Girl = Mental Girl
18. Elasti-girl + Changeling = Changeling Lass
19. Beast Boy + Cyclops = Mythological-Beast Boy AKA Chimera (has 'gorgon vision' and can change into mythical animals)
20. Deathstroke + Mr. Sinister = Mr. Death, the Sinisterminator
21. Terra I + Madelyne Pryor = Terra Queen
22. Terra II + Rachel Summers = Terra Marvel
23. Jericho + Nate Grey = Jerich-X
24. Firebird + White Queen = Sapphire Bird