From: ryamis | #062
Does the console code to change the level of your follower affect their skills or abilities, because I heard those do improve? I'd mention that they don't care about you committing crimes.
"Refreshing" the characters does affect their skills, yes. From what I understand from the various topics on the board, followers do increase in actual level normally; some people claim that their early-game Lydia would run away when they use the werewolf's howl of fear (which affects anyone under level 30 iirc) but late-game would not run away.
The problem is that the only thing that changes is the level itself, and not the actual stats and skills. Refreshing the character with the console fixes that, albeit only up to the level you are currently at when you do it (so you refresh the character at level 30, but you'll still need to do it again at level 50 because the follower will have level 30 stats).
In regards to crimes, followers just have a VERY high tolerance for your criminal activities. However, they will eventually attack you if you hit them enough in a short amount of time while outside of battle.
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Kenshin's the Beauty, Kaoru's the Beast? - Mister_Feeny
Would that make Shishioh the candle guy? - Gettles