I don't quite understand the rarity, the Rare ring he had is worse than that Normal ranked Fountain Pen.
Albeit, the ring technically had 10% int, but with his int at 5, and he did kill a mob that low tier awkened couldn't kill, what kind of stats do the B->S rank awkened have? For 10% to be greater than 20 flat, they would have to be more than 40x stronger than he is now? I guess it has -3 str and a difference of 80 mana (we have no idea how big the mana pools are) but a main stat difference of 0.5int vs 20 is pretty big.
Also that Kettle is insane if that's a perm max mana increase. Sure it would take some time, but that's the kind of thing you'd bring to a guild and have everyone drink tea multiple times a day while training, it's an insanely good item.
Belt is "magic" and has flat 50 Endurance. Which is clearly higher than a flat 20 int. The potion thing seems pretty lame though.
Idk it's a bit confusing... I guess %stat is always going to be valued, but it does depend on the system.