Duskstar

While this could be accurate (I'm not a scientists) and I agree with this, at least in the show the cannon is that each multiverse 1, 2, 3... 52 has its own timeline and when Barry goes back in time he overwrites the future, of his current universe, that's why in season 3 Harry Wells and Jesse didn't recognize the speedlab even when Cisco and Caitlin remember them being there during the creation of the speedlab.

not really, just for fun

I spent 10 minutes trying to remember a ZanZas, who had s double element Beast.... You meant Xanxus and his Liger Tempesta di Cieli, I can totally go that route, but it wasn't a double element per se it was a Special Flame powering the Leone di Cieli giving him an "evolution" like Uri after spending time inside Kangaryuu

Yes, but sealed memories...even if he remembers all is more like watching a movie than being affected by them, at the end of the day he is who he is not the memories. P.S. i know confusing, but can't find another way to put it.

Tungsten was my first idea, due to its strength, resistance and density for the magnet style, but after some quick research I found that is easier to find Titanium in the form of Ilmenite than Tungsten, maybe I'll change it in the future but for the moment I'll stick with Titanium, that has a density equal if not higher than most minerals Gaara/Shukaku could use for it's sand (this is why the fourth Kazekage used Gold for it's magnet style)

tbh I don't remember the melting point

Preference