how smart was the first six eyes user

The first Six Eyes user is not clearly defined in canon, so there is no official statement about how intelligent they were. What the series does establish is that Six Eyes greatly boosts perception and cursed-energy efficiency, which suggests exceptional combat awareness rather than a confirmed “genius level” IQ.

What can be said

• Six Eyes gives heightened perception, better cursed-energy reading, and extreme efficiency.

• That means a user would likely seem very smart in battle, especially with tactics and split-second decision-making.

• But the manga and fan references do not give a verified biography or measured intelligence score for the first user.

Practical read

In other words, the safest answer is: probably extremely sharp, but not officially quantified. The ability itself makes a user look brilliant in combat, but the first Six Eyes user’s actual personal intellect is still mostly unknown.

In forum terms

People usually treat the first Six Eyes user as “ancient elite tier” rather than “book-smart genius,” because the power mainly enhances perception and control.

TL;DR: the first Six Eyes user was likely very perceptive and tactically smart, but canon does not confirm a specific intelligence level.