If I chose a sword - Meowmere! Dangerous and shoot KITTEHS!
If I chose a ranged weapon - Megashark. I would've chose Tactical Shotgun but that's in real life to, so I guess it doesn't count.
If I chose a magic weapon - Either the Flower of Frost or the Rainbow Gun.
If I chose a summoning item - Eater's Bone or Pygmy Staff. Baby EoS is super cute and who doesn't want some tiny tiki guy shooting javelins at your emenies?
If I chose a tool - The Axe
If I chose an equipable - Ice/Frost Wings
If I chose an armor set - Turtle Armor. Whoever bothers to hurt me will feel it right back.
If I chose a consumable - Life Fruit. I would become tougher and stronger. Also I would literally have a heart of gold!
If I choose a potion - Greater Healing Potion
If I chose a vanity set and dyes - Plumber's hat and Mining Shirt dyed Sky Blue, Mining Pants. Or all rainbow dyed.