Hmmm... a few come to mind. Not all may fit
'All We Know of Heaven' by Prospero Hibiki
'Changes' by gromittd
'Handed On A Silver Platter' by grookill
'The Plan' by Tonbo
'To Tell a Hawk From a Handsaw' by N Reynolds
R-AA 'Prisoner of the Iron Mask' by Multiple
R-AA 'Setsuna's Fault-Wonder About Zero' by Kestral
R-AA 'Sightless Spark' by KLSymph
- note there were many attempts at this story by KLSymph, also see:
R-AA 'Restart Deluge Sightless Spark' by Multiple
R-AA 'Festina Lente' by KLSymph
R-AA 'DemonKen' by Multiple
R-AA 'Ranma Evolution' by Multiple
R-AA 'The Journey to Red' by Multiple
R-MGLN 'Home' by NeverwhereCM
R-ME 'Wild Effect' by Largo
R-MULTI 'Chaos Factor' by Nemo Blank
'Guardian' and 'Millenium' both by Black Dragon
R-PAKO 'Project Ako Ranma OVAs' by weebee
R-SGSG1 'Snake in the Horse's Shadow' by Lord Raa
R-XMEN 'Prime Attitude' by C Rose
R-SM 'Destiny' by Gabriel Blessing