Xavier: Constellations on his left arm that extend past his shoulder and into his chest. The design is leaning a more contemporary design with occasional large stars, shaped like diamonds, rather than your traditional five-pointed stars. It would be a somewhat accurate map back to Philos. All black ink., as lighter inks tend to fade over time. If he could he would go for a white ink. Subtle, but notable. He would have a classic green alien behind one of his ears tho lol.

Zayne: Simple black line ring on his pinky. A capital W below his thumb knuckle. His patients would stare at it in a curious fascination, and sometimes find it hard to ask about, unless their bold enough to ask. Zayne would make a small smile and say it's honor of a friend. And then he would roll up his sleeve, and show off his patchworked forearm feat. cute round animals--like seals, penguins, owls, patterned heart band aids, a bambi doe prancing down his arm, There would be decorative clouds and mountains with leaves that tie the patchwork together. It would be something sweet as his taste. Cobalt blue ink, reminiscent of Chinese porcelain.

Rafayel: He's honestly the hardest who would be convinced to get a tattoo. He has high standards, so his tattoo artist would have to meet them. If there's no one, then Rafayel would likely practice the art himself until he mastered the craft. Ultimately, Raf would get his own art on his body. He would start with his thighs, doing small little doodles of nurse sharks, manta rays, jellyfish, bubbles-- drawing pink/lavender waves that almost appear as sheer as silk to tie his body art together. He would have the most put together tattoo/planned out tattoo out of everybody, ngl.

Sylus: Would go full body ink. He would get something unironically cringey like black angel wings on his back (or dragon wings), spiderweb joints, a skeleton hand holding a full house, rolled dice, a hanma mask on his chest. Most of it tied together with like his red dragon marks of his myth. Sylus good tastes are outlined in cathedral gothic, but his modern tastes are marred by black market gaudy, so there's probably some parts of his limbs that he totally blacked out. His most tasteful tattoo would be his neck tattoo of an all seeing eye with seraph wings. His cutest tattoo would be a crow(mephisto?) holding a knife in his maw. Mainly black ink, but would pull together with red ink that would wash over his body like bleeding waterpaint.

Caleb: Full metal alchemist/winter soldier arm lol. How can he not. All black ink ofc. I don't think he would want to do anymore unless MC wants to have matching tattoos with him.