I'll copy and paste my previous comment (an argument that Kaden is now the likelier demote from this banner than Velouria) that Velouria is basically the support version of Surtr (latter part of comment):
From this thread:
https://fireemblem.gamepress.gg/q-a/just-fyi-guys
"Velouria will be relatively strong for what is available to an average "f2p" player's barracks until there is a 168-bst [to be clear, infantry or flier] released in GHB or Tempest Trials or some such.
"I'm hoping Velouria is the demoted unit, but I now think it will be Kaden.
"If you think about which would help a new player more, the answer is definitely Velouria. She's more "OP" in that all a new player has to do is link her with another unit and press play. A new player with Kaden would have to find all of these different skills from different units and inherit them onto a new team.
"Velouria is like a supporting Surtr, she makes the game really easy if you get her."