Also remember that there has to be a first time involved with every echo - not just a "first time in the echo boundary" but a "first time in his life".
So an option if you don't want two tattoos could for example be for him to never have had a tattoo on [body part(s) Uta's tattoo is on] and getting a mock-up of a tattoo done in henna on that body part for the very first time, to see what it will look like - but while the temporary tattoo fades, the preincarnation's tattoo comes in.
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Also remember that there has to be a first time involved with every echo - not just a "first time in the echo boundary" but a "first time in his life".
So an option if you don't want two tattoos could for example be for him to never have had a tattoo on [body part(s) Uta's tattoo is on] and getting a mock-up of a tattoo done in henna on that body part for the very first time, to see what it will look like - but while the temporary tattoo fades, the preincarnation's tattoo comes in.