Inigo explains this when asked "tell me about yourself" a few times, and the information is also available on the Nexus Mod Information Page. An example is that due to being raised differently, Inigo's linguistic ability is more first-person than the typical Khajiit third-person. A lot of details can be found out through interaction with Inigo and responses may depend on the player's choices.
Inigo tells of being an orphan, having a Khajiit mother and Argonian father, along with a Khajiit brother. The player can find out a lot about Inigo by chatting with him.
Situationally aware like other vanilla followers to occasionally comment on nearby caves, but also occasionally comments on the events within, and discusses with the player after completion (not DLC aware). Unique "whistle system" to communicate with the player. Can interact with other NPCs, or be silenced. Interaction with certain other Vanilla followers (e.g. Tells stories, sings, laughs and jokes, and is influenced by the players time together. Skills: highly skilled in archery, one-handed and sneak. Doesn't talk while the player sneaks (if conversation is initiated, he'll whisper). 
Over seven thousand voiced dialogue lines, all of which are condition based and do not fire randomly so you don't get the annoying repetitive chatter, like with most followers. Unique, random battle dialogue for most enemies.
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