Archduke Ferdinand of Austria was born in 1551 as the firstborn son of Maximilian ii holy roman emoeror, he died in 1552. I've got a rough idea of what I'd have him be: mainly interested in scholarly pursuits, and perhaps some political shenanigans. He'd get on with both his younger brothers rudolf and Matthias, and be less than friendly with the Styrian branch.
With this in mind, who could possible marriage options be? I'm struggling to find someone suitable, no spanish infanta of the same age. Perhaps Margaret of France, if Henry ii lived longer?
With rudolf not ascending the purple what else is likely to change?