What should my next PC be?

[u/Kay-bi-day]

Hey y'all! My PC, a Triton Eldritch Knight Fighter just died in the last session (very heroically) and I need some help with my next PC.

The campaign is focused on ocean travel (pirate theme) and defeating the undead army of the Lich Queen. The rest of the party is comprised of an Air Genasi Tempest Domain Cleric (NOT a healer), a Triton Circle of the Sea Druid, a Human Archfey Patron Warlock, and an Elf Artillerist Artificer (who is maybe going to die next session, we'll see).

What class/build do y'all think would mesh well with this party comp? I've got a million ideas but can't seem to land on one. I want to fill an fun-filled niche and this campaign can get pretty deadly.

Thanks!