Fun fact. Thee, thy, thine were actually pronouns to be used with your closest people, and you, your, yours were the formal versions, used to show respect
I think that Haimiya senpai is showing Ionisation enthalpies, and not tendency, on the first page. Lithium and potassium have a very high ionisation tendency, cause their first Ionisation enthalpies are low. And it's the reverse for Platinum (and what I can assume are on either side of it )...
It's his name that's also his title. 'Shiou' is his name, and you can read it as Shi-death/corpse and ou-prince/king. (This is my inference based on my minimal Japanese knowledge. I have zero Kanji knowledge, so I could be wrong. )