I use the tool FollowersAnalysis to identify influencers.
These are the metrics that you get with the top followers and following of a Twitter account in the FollowersAnalysis report.
You can find the most popular Followers of the Twitter account
Find most active followers (followers with the highest number of tweets posted)
Export twitter following list of any public Twitter account
Export Twitter followers to Excel of any public Twitter account
Know followers with the maximum number of likes
Know followers with the maximum number of lists
And if you want to gather any other Twitter data for your Twitter marketing strategies you can visit their website and they will readily assist you with your queries.
If you're talking about scrapping, there is Twitter Scrapper, and I'm pretty sure that there are more, but this is the first thing that came to my mind.