I made one AI character. For the record, AI riggers are nearly broken, while AI deckers are incredibly vulnerable and tend to be worse at hacking than metahuman deckers.
The character I made was named SAINT; it was an AI born out of the pilot AI of a nurse/medical-assistant anthrodrone that had been used by a shadowrunner, but then got heavily damaged in a run in Chicago (the runner and his team died). SAINT was found by a scavenger and mostly repaired. I had fun playing up the Real World Naivety through the lense of "what would an pilot for a hospital drone know". So it knew about metahuman biology, and by virtue of being a drone first, had a more founded understand of what physical meant. It also understood an amount of psychology and basic etiquette, so I didn't have to play it as a total Blue/Orange Morality alien-mindset being. Its major blindspots were magic (outside of healing) and the value of money. I played SAINT with it not being fully aware it was truly an AI; it still acted subservient most of the time, and had no idea it was capable of leaving the anthrodrone it had been "born" in. This, combined with its medical knowledge, meant that it legitimately had a concept of death and thus self-preservation. SAINT was fascinated with how learning things felt, and I looked forward to having it gain more self-awareness and become more powerful as it broke free of its self-imposed limitations.
Unfortunately, the campaign fell through and I lost the computer with SAINT's character sheet. However, I may remake SAINT some day since it was just such a good character and a lot of fun to roleplay.
AI characters are very difficult to build. The rules are flawed and there's a LOT of parts that don't make sense or simply seem non-functional. I've combed through them as part of the errata team but coming up with solutions for them has been difficult (and my focus has been in other books). If a player wants to play one, you'll have a lot of headaches to deal with facing inconsistencies and blind spots in the rules, on top of the fact that an AI character's effectiveness varies wildly. It's a mess. But they have a huge amount of story and roleplaying potential.