series is mandatory. The others are:
size, default 50px.
suffix, default blank, in case the intent is to display something like
MarioSymbol(preBrawl).svg(which is the only suffix at the present time).
link, default being a link to the relevant universe page.
For the convenience of those who wish to edit this template, it is sorted alphabetically by symbol image file name. You should probably keep it that way.