What champion out of these listed should I get?

Bard, most fun champion in this game and very rewarding once you get good with him.

Personally I go with flex picks. That way, I can fulfill multiple lane assignments while mastering one champion.

So I'd probably go Ekko, since he's been played mid, top, and Jungle.

Ekko definitely. Although if you get good at Azir you will carry the **** out of games.

Bard