My two "Terry" characters - the one I started the game with on the left and his newer version on the right. Left uses full Hallowed Armour with Mask and Lava Waders in full Purple and Black Dye, Worm Scarf with Unicorn Wisp Dye, and Nebula Mantle with Skiph's Blood as vanities. Yoraiz0r's Spell in the near-last slot provides his eye effect. Nebula Mantle in particular has a very nice afterimage effect with certain special armour set visuals and looks fantastic with the right dyes. Right uses full Loki's Armour with Violet and Black Dye, no Lava Waders or Spell, but the same vanities and dyes otherwise. One thing worth noting is that even though they're using the same wings with the same dye, Nebula Mantle looks slightly different because Hallowed Armour and Loki's set have slightly different pulsating effects.
Not displayed is the black cat with violet gradient on the left, and Nebula Dye Propeller Gato on the right.
Karin, the melee DPS. It turns out you can dye the Familiar Wig, so I used Pink Dye to give her hair a slightly brighter shade than its default. Red's Breastplate and Leggings, Lava Waders, and Solar Wings all use no dye. Mechanical Glove plus Shadowflame Hades gives a neat effect, and she also wears a Worm Scarf with Infernal Wisp Dye. I've tried dyes on her armour, but ultimately decided it looks best with the additional contrast the default look provides. Seems to appreciate a Betsy mask on occasion.
Akemi, the third mage. Similar to Karin with Familiar Wig, Nebula Breastplate and Leggings, but no dye on any of them. Solar Wings plus Stardust Dye, and Worm Scarf plus Wisp Dye. I've also tried dyes with her armour, but again, the default appearance of Nebula armour adds a little extra life to her outfit instead of one solid colour theme throughout. More than any other set, this one seems to mesh best with the Void Dyed Suspicious Looking Eye that all my characters use.
Erina the summoner (and her friends)! Jungle Rose with Chlorophyte Dye. Yoraiz0r's Uniform and Skirt with Chlorophyte and Shadow Dye respectively.
Apprentice's Scarf instead of Worm for a change, using Chlorophyte Dye, and Vortex Booster with Green Dye. Truthfully not entirely satisfied with this one just yet, but I'm still working on it. Also works well with a no dye Moon Lord Mask and/or Chlorophyte Solar Cultist Robe.