What items and materials are important to keep from pre-hard mode for hardmode?

D3WR1T05 asked on reddit: What items and materials are important to keep from pre-hard mode for hardmode?

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If you are running out of space in your chest-room, i would recommmend building a bigger one and transfer all your things.
In case you dont know: you can alt-click to favorite things in your inventory. Favourited items cannot be quick-trashed, quick-stacked or deposited. Then you can click the 'loot all' and 'deposit all' buttons when a chest is open to quickly shift your stuff from one chest to another.
A list of things i would definitely keep (not claiming to be complete):

• Iron (lead) ore: some crafting recipes need iron
• Wood: some crafting recipes need wood
• Gold (platinum) ore: boss summoning
• All plants: potions
• Fish: potions
• Seeds: more potions and biome spreading
• 20 40 Hellfirestone bars: for the last mount you can get
• Accessoires: maybe you can combine them later
• Gems: if you want to build something shiny
• Of course you want to keep your current loadout
• Everything else
•  40 Hellstone 
• 40 Meteorite bars
• Cobweb/silk
• Pumpkins
• all lenses and vertebraes/rotten chunks

Thanks to /u/Incoherrant and /u/i_wanna_be_the_guide for the help making this list.

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What did we miss? Tell me :)