IC Pins with adjacent same net need to be made as common shape?
Depends on the kind of circuit you have. You said it is a transistor array. 

If these transistors just commutate low-current signals, then you better leave it as is – with thin traces connecting adjacent pins. This will make it easier to hand solder because less copper is less thermal mass.

If this transistor array commutates (relatively) high currents, as in H-bridge motor controller (or relay controller, as you said it is), then you want to have as much copper as possible there, to lower the trace resistance. In this case, connect the pins with traces as you did, then draw a polygon with the same Net name, covering both pins and an outgoing trace.