Hard to nail down to a specific one or two, but here's a few of my favourites:
Fairy wrasses - I've had 4. I love these fish. Stay small, gorgeous colours, nice disposition, totally reef friendly. A little shy and long time to get unshy I found. My first was a C. rubriventralis (see pic below), common name "red fairy wrasse". Had the nicest red colour and these blue irridescent dots that would come and go depending on his mood. Plus, he had these really neat fins. I lost him when I moved houses.
It turns out I've lost fish every time I've had to move my ritteri (it releases something as some kind of defence mechanism).
I had a lubbock's wrasse. Very pretty fish. Unfortunately I don't seem to have any pictures. Lost this fish to the anemone as well.
My potter's angel is a darling... Just a great personality. She mimics the behaviours of the fish around her .. it's really neat to see. Actually I had another potter's that would do the same sorts of thing. I thought it was pretty clever. I unfortunately lost the first potters in another anemone moving incident.
Here's the one I currently have.
My Z. desjardini sailfin tang .. I dunno, I just love this guy. He's been with me 5 years now.
Oh and I'm totally with you on the lawnmower blenny. I had "Rygel" (Farscape fans? Catch the reference?) entertaining many a visitor with his antics, what a personality. If I cleaned the outside of the glass he would chase the cloth away and wouldn't give up trying to bully it until the "invader" left.
He lived for me for just over 4 years. I'm not sure what their livespan is but I think he may actually have succumed to old age. It was a lot like old age towards the end.
