I know Fiona Fox first appeared in the knuckles comics. Are there any other appearances of Fiona Fox especially whenshe joined the Freedom fighters in Sonic the Hedgehog aside from #160 and 172.
Well the Robot version of Fiona was in issue#28 I believe. The issue where Sonic fights the Freedom Fighters under Robotnik's control. During the Home arc, she makes her main appearances. Where she has been seen ever since.
Robot!Fiona was in #28 and #29; real Fiona was in Knuckles #26-#28, then showed up again in the crowds in #125, was (I think) briefly in the "Home" arc in #130-#134, and started to really show up in "The Good, the Bad, and the Unknown" (#146-#149), made an appearance in #152, and was dating Sonic by "Line of Succession" (#155-#156).
God I wish I could remember my university work this easily.