|Me and my new tattoo - for Terra Nova larp|
There are many different tattoo styles. Some could be very appropriate in-game. You may actually consider doing a temporary tattoo for in-character purposes, or it might be even dictated by your culture - like Tauron characters on The Monitor Celestra.
Some of the existing tattoos (and piercings too) which are not period or culture-accurate can be incorporated into your character with some . There was a good article on larping.org detailing this in February.
Of course, there are always tattoos (and possibly larps) where a tattoo would be out-of-character. However, long, covering clothes are in-character almost everywhere.
Do you have examples of good larp tattoos? Share them below.