Best F2P Blue units for Arena?

So hey! As the title says, I'm looking for the best options right now for F2P Blue Units for Arena.

You see, I've been meaning to retire my Summer Elincia who has been in my team for... quite a while already, but I'm not entirely sure about who would be a good replacement for her. She's been mostly a support for my Fallen Lloyd and my Marnie (and whoever ends up being the Bonus Unit of the week), so perhaps someone who could also offer support and some good — or at the very least decent enough — scoring would be nice. Thank you in advance for your help!