0
most importantly, more importantly
Importantly.
Yes, the term 'most importantly' is the superlative formof the adverb 'importantly' (importantly, moreimportantly, most importantly).
Example: Most importantly, he remembered my birthday. (modifies the verb 'remembered')
It indicates performance or action
If the word after more importantly is a proper noun, then it should be capitalized.
Example:
More importantly, Raizza should be there first thing in the morning.
More importantly, the guests should be there first thing in the morning.