Warning: This might sound dumb.
We have many lines in action poses. A few in borderline museum poses. I want a line of highly intelligent characters just sitting there hatching a plot. I want to look at the diorama and wonder what they're planning.
I want an ILLUMINATI boardroom:
Tony Stark (armored but maskless)
Charles Xavier
Reed Richards
Doctor Strange
Black Bolt
maybe Black Panther too.
OR...
The Cabal:
Norman Osborn
Emma Frost
Loki/Lady Loki
The Hood
and of course, Doctor Doom
Namor could belong to either of the lines. Or even both.
Something like this, but better:
The only downside is that the individual pieces won't look any good. You'll need to collect most of the line for it to have any impact.