The new kids like Batgirl, Tim and Wonder Girl got less focus I agree, though we did see Tim moving from his first team leadership role to being more experienced as the season wore on.
I thought the Runaways (or the Metagene Kids got a good deal of development and were fun analogues (I also liked that Asami didn't conveniently speak English and none of the others knew much Japanese because chances are, they wouldn't) . We saw them introduced in some cases, then being abducted, experimented on, gaining their powers, learning to refine and control them and their adventures with Arsenal.
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I thought the Runaways (or the Metagene Kids got a good deal of development and were fun analogues (I also liked that Asami didn't conveniently speak English and none of the others knew much Japanese because chances are, they wouldn't) . We saw them introduced in some cases, then being abducted, experimented on, gaining their powers, learning to refine and control them and their adventures with Arsenal.