I like Lorne. My fav episode with him was Spin the Bottle from when they did that spell to help Cordy remember who she was and instead they all got amnesia and thought they were teenagers again. I love how Lorne nararated the show. Besides him, I also like Lilah...I wish it would've worked out for her and Wes.
On Angel, it's definately Willow. I love how she went from a weak, shy school girl and turned into, as Kennedy put it, a Goddess. There was so much to her that I really enjoyed. If fact, if they were to make a spinoff, I would be perfectly happy if it were The Witchy Life of Willow (or whatever else sounds catchy) and it would co-star Xander and Anya (who Willow resurected or course) with guest appearances by Spike, Faith and maybe occasionally Buffy but only if Buffy and Angel come together.