|David Palladini's depiction of Aquarius|
Humanitarian, another commonly stated characteristic of Aquarius can be apt, but fits more nearly with Pisces in reality. People with Sun in Aquarius often have a planet in neighbouring Pisces.
Intelligent? I'll go along with that one, it's the only description common to all Sun Aquarians I've ever met. Intelligent, mind you, not genius or even highly intelligent. They simply possess an innate cleverness irrespective of schooling or higher education, which, in some instances when applied can bring out inventive talent. Aquarius is Fixed Air. Air relates to mental processes, so it's reasonable to expect that all Air signs (Aquarius, Gemini and Libra) will share natural intelligence, honed to sophistication by education, or not, as the case may be.
"Love of groups"? Where did that oft recited keyword for Aquarius come from? It contradicts another Aquarius motif: "aloof, detached and cold". I haven't yet met a Sun Aquarian who loves to join groups. I run from them, as did my Dad, and other Sun Aquarians I've known. We can, arguably, appear a tad aloof and detached/reserved. I prefer to think of that as independence or an intense need for freedom - and those are certainly keywords for Airy Aquarius.
I think many commonly used Aquarius keywords (quirky, avant garde, eccentric, radical, rebel etc) belong more properly with planet Uranus, delegated to replace Saturn as ruler of Aquarius in modern astrology. I continue to suspect that Saturn was more appropriate as ruler of Aquarius; a Saturn in Airy mode, lighter and less tied down; Capricorn hosts a heavier, Earthy Saturn.
My old and fragile copy of Llewellyn George's Student Chart Reader (1934), has this to say about Sun in Aquarius:
"In Aquarius the Sun gives a quiet, patient, determined, unobtrisive and faithful nature, as a rule. The Aquarian is refined, pleasant, friendly, generous, charitable, dignified and humanitarian; fond of art, music, scenery and literature; cautious, steady, intelligent, intuitive, discriminative, concentrative, studious, thoughtful and philosophical. Good reasoner, practical as well as theoretical; strong likes and dislikes and often with very radical and advanced ideas; is cheerful, sincere and honest, easily influenced by kindness, slow to anger, but will not be driven; loves liberty and is fond of occult research."
I like that description, even though parts of it are too general to be identifiable as pure Aquarius - eg. pleasant, fond of art, music, scenery. I especially like the the last few phrases (easily influenced by kindness, slow to anger, will not be driven; loves liberty). Interest in the occult applies to this particular inmate of the Sun in Aquarius camp, but I haven't personally met any others with the same leaning. Perhaps this is another facet belonging more properly to Pisces, although there are two Fixed Stars in Aquarius with traditional connection to astrology.
So my own, stripped down, bunch of keywords for Aquarius:
Radicalism, avant garde, rebellion and quirkiness will, in my view, be a part of the Sun Aquarius-type, or any other sign's makeup only if Uranus is in close aspect, or on a sensitive point in the natal chart. That's my story and I'm sticking to it -'cos I definitely will not be driven!