Yukiko is low “execution” but her technicality makes her just as difficult as a medium-hard execution character. Too much geometry and Persona control/timing required, much like the ways of Elizabeth. Her more advanced combos actually are execution intense as well.
Execution for characters can vary on level of play and areas of execution difficulty.
Akihiko could be low execution at a low level of play, but becomes much more execution heavy the more advanced you want to get with him. If I remember correctly, variations of his fatal combos are extremely tight and even the way his specials work may prove difficult. Overall, I would not say he is an easy character to play, nor is he a character that can be played with little effort.
Shadow Labrys can actually be considered low execution because her combos are extremely simple. However, she becomes execution intense when attempting to play more advanced by controlling Asterius in tandem with Shadow Labrys. This is more technical than execution however.
It also depends on what kind of level of execution are we talking about. Is the execution at the level “my combos are also my blockstrings” or is it “I understand the fundamentals of footsies”?
Though I will agree with Celerity that a low level Kanji and Yu will still get you ahead. These are characters that can still perform optimally with low execution, and become exceptional with higher execution. Labrys at a low execution will also get you somewhere.
Lower down, I also think a low execution Chie, Naoto, and Yosuke also will work. These characters require slightly more execution to play optimally, so if your level of execution is not that bad, perhaps these characters will work. Naoto does play the best at very high execution because of SMP loop, but can still function without it using proper fundamentals.