ACR ACFT LINES UP FOR RWY AT WRONG ARPT AND SCATTERING TFC.

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I WAS WORKING LCL CTL AT CAPITAL CITY TWR WITH 2 SMA'S IN THE PATTERN; RWY 12R TFC. I OBSERVED ACR X; AN MLG FLT TURNING FINAL FOR CXY RWY 12 AT CXY. PLT SHOULD HAVE BEEN LINING UP FOR RWY 13 AT MDT. THE PLT OF ACR X CREATED A CRITICAL SITUATION; UNOFFICIAL PLTDEV! SMA Y WAS ON BASE LEG FOR RWY 12 TO MAKE A TOUCH AND GO WHILE ACR X; STARTING FINAL APCH FOR CXY RWY 12. ACR X CREATED TURB FOR SMA Y. SMA Y CLBED HIS ACFT AND TURNED W AWAY FROM ACR X. SMA Z WAS EXECUTING A TOUCH AND GO RWY 12 AT CXY; SMA Z WAS STARTING ROTATION (LIFTING OFF) WHEN ACR X STARTED GOING AROUND ON RWY 12 CXY. I PROCEEDED TO TALK TO THE PLT OF SMA X TELLING HIM WHAT I WOULD DO ABOUT CLBING OUT; MAX CLB RATE; AND TURN R TO GET OUT OF THE TURB CREATED BY ACR X GOING AROUND. MY COACHING (NOT MY JOB) SAVED THE ACFT ENCOUNTERING TURB AND A PROBABLY CRASH ON UPWIND TO XWIND. ACR FLTS; ON OTHER OCCASIONS; ALMOST TURNED FINAL FOR RWY 12 CXY WHILE EXECUTING A LNDG ON RWY 13 MDT. MY PEERS ADVISED THEY HAVE SEEN IT HAPPEN BEFORE!