To me, Blackquill is almost like a tribute to all the previous main prosecutors. He's got Edgeworth's logic and ability to play mind games, Franziska's penchant for physical punishment, Godot's love of nonsensical parables, and Klavier's tendency to nickname everybody he meets.
But beyond that, he brings out the best in Apollo and Athena. He's just so good.
https://imgur.com/WqDcNNq
https://imgur.com/89Z5jrB