Pretty much every character on TNG had major character development. Just because it wasn't plainly obvious didn't mean it didn't happen.
Troi went from being the feelings girl to one of the more important members of the crew, effectively becoming #2.
Worf went through a long ark with his klingon heritage, his son, etc.
Data had endless growth.
Picard was assimilated, had contact with the probe, contact with his brother, was tortured, learned to like kids, learn to deal with wesley, had his thing with various women etc etc.
Riker had his initial babyface phase, his relationship thinger with troi, his relationship with his dad, thomas riker, given multiple chances at captain, etc. His conflict with jellico etc.
Wessley had his path, barclay his, etc.
If you pay attention there was an endless number of things that related to soft serialisation.