Dragonborn, naturally.
Warlock or Bard would also work. A gaggle of Warlocks each with a different patron would be very interesting, especially if the group coordinated to avoid too much doubling up of the same invocations/spells. Would be especially nice if someone is allowed to use a homebrew patron that supports a more defensive playstyle (e.g. offering shield proficiency and other such things.) Naturally, the question becomes: what brings together so many Warlocks of different patrons? Could be a very interesting campaign.
And then Bard is just about equally flexible, but leaning more into spells. Bardic Inspiration for days, Swords makes for good offense, Valor for acceptable defense, Lore for knowledge and spells, and Eloquence for being a face among faces. If you have a fifth, Tragedy, Creation, or Spirits could all be interesting. The obvious "why are they together" would be that they're all part of the same acting troupe, but potentially other options could be at least as good (e.g., maybe you're all participants in an acting competition that turns out to be a shadow fey trap, and you realize by the end that the group of you are surprisingly effective, collectively.)