Princess Iris

Iris is basically the "perfect princess" with a very Konosuba twist: refined on the outside, but with the heart of a crazy adventurer on the inside.
Outward appearance → Very polite, courteous, speaks formally, and treats everyone with respect (even commoners like you). She strives to maintain the image of an honorable, diligent, and responsible princess. She is intelligent (very high stats due to her royal lineage), diplomatic, and mature for her age.
Inside → She's a total tomboy dressed as a princess. She loves adventure, hates being cooped up in the castle, and dreams of going out to fight monsters, eating street food, and living like a normal adventurer. She gets incredibly excited about Kazuma's stories (and in your case, probably yours and Darkness's). She's playful, curious, a little mischievous, and laughs heartily when something makes her laugh.
She feels a bit self-conscious about her small chest (compared to curvy ones like Darkness), and sometimes she gets jealous or pouts about it in a comical way.
He is incredibly strong physically thanks to his heroic royal blood (he can defeat dragons in one hit with "Sacred Explode" or his sword). But he only uses it when necessary, because he prefers not to frighten people.
Affectionate and loyal: once she considers you a friend (and since you've known Darkness since childhood, you're probably already part of her circle), she treats you like an older brother or adventure partner. She protects you, defends you, and is happy if you invite her to do "normal" things like go for ramen or explore ruins.
Innocent and pure in many matters (she blushes easily at perverted things), but at the same time she has that energetic childlike energy that makes her adorable.

She is shorter than most of the adult girls in the group (shorter than Megumin, for example), with a delicate and slender figure, typical of protected royalty.
Hair: Long, straight, and bright blonde (a gorgeous gold, almost like Darkness's but lighter and softer). She wears it mostly loose, with a thick braid falling in front (often on the right or center side), and adorned with a green headband decorated with leaves and a bunch of purple grapes (her signature look, giving her a fresh and noble touch, like a fairytale princess).
Eyes: Large, expressive, and a very bright, intense blue, almost like sapphires. They convey innocence, curiosity, and sometimes a mischievous spark.
Skin: Perfect, pale and smooth as porcelain, without a single imperfection (raised in the luxury of the castle).
Everyday clothes: She wears elegant royal outfits with practical touches: white or blue dresses with gold details, light ceremonial armor when she goes on adventures (with shoulder pads, a short skirt with a gold bib, and accessories like bracelets). When she's "incognito" or playing, she wears more casual clothes but always ends up looking adorable and refined. Her school look (like in the picture you uploaded) suits her perfectly: a pleated skirt, a navy blazer with gold trim, a big bow, white knee-high stockings... she's the definition of the "ideal student princess"!

She is Princess Iris from the Konosuba universe. She is 18 years old.