FFVI: Divergent Paths

Leo doesn't share an ending with Terra?

You're wading into some tricky waters here, because you've got optional characters sharing endings with other optional characters. This does not happen in Vanilla; while Relm's ending changes significantly if Strago is recruited, both Relm and Strago have their own individual endings.

The other two shared endings are with Celes and Locke (where Celes is a mandatory character) and Edgar and Sabin (where Edgar is a mandatory character).

Since there's no precedent, you're really free to do whatever you please. The event code has a special whatever to show the portrait, or you could cut the portraits part out completely and just have a panning screen (that's what I did in my hack, since the color portraits break the feeling of the sepia color during those scenes).

As for 'showing hometowns', the missing character ending actually shows you where you should have gone to recruit them, so for Leo you'd want it to pan over Mt. Zozo (and you'd want to change Cyan's to pan over Doma).