There are a few other notable kitties that have walked on from time to time.  None of these have been indoor.

Knucklehead was around for a short while, and involved himself enough to get a name.

Jughead had a short and unhappy visit.

Ebony was around for a while, before Sunny appeared.

Steve came around for a while. Didn't know how long he'd last, if he didn't stop fighting: he picked fights with every male around.  I haven't seen him in a long time.

Dude is a nice looking male that comes around still from time to time.  I tried to move him in; didn't work.

Shadow is the passer-by that stayed. It took patience to move her inside; she's now a dedicated owner.