How Deep?: He doesn't wear his heart on his sleeve, but he's completely unguarded to telepathy so Charles could dig as deep as he wanted.
What Sort of Things Will He See?: Marco's a pirate, a phoenix, and still sort of really trying to work through the death of his father via ex-crewmember as well as that betrayal and the aftermath of how Blackbeard stole his father's special ability (like Marco being a phoenix) and could destroy the world with it (earthquakes).
Like Magneto, Marco is obsessed with revenge. He's spent several decades making his pirate crew famous for that so that any time someone around the world saw his tattoo/their pirate flag, they knew what it meant. However his father originally asked the crew not to hunt down Blackbeard, one did anyway, lost in the fight, got turned over to the marines and when the crew tried to rescue that one, that was when Blackbeard took advantage of the situation and killed Marco's Pops/Captain/father. Marco's still pretty big into the vengeance gig though and he doesn't regret the people he's killed at all.
Abilities?: Phoenix! Marco can turn into a blue fiery phoenix and he's one of the only zoan (animal type devil fruit user) to be able to control how much he turns into at a time. (just wings, just blue flames, individual parts of either human or phoenix etc.) The flames don't burn but they give him "limited regeneration" which is basically on par with Logan/Wolverine's. He's also strong, can fly, etc. He's weak to ocean & seastone which Marco would be unlikely to mention but could be pretty easily sensed. Not being able to swim is curse of all devil fruit & roughly the only way to kill Marco.
Anything he shouln't mention?: Never ever ever insult his father. Ace died defending Whitebeard's reputation and Marco *loves* his Dad to itty bitty pieces. Insulting Whitebeard would get even people he loves kicked through walls. Likewise insulting Ace would be a very bad idea.
Massive One Piece spoilers, hope you don't mind
How Deep?: He doesn't wear his heart on his sleeve, but he's completely unguarded to telepathy so Charles could dig as deep as he wanted.
What Sort of Things Will He See?: Marco's a pirate, a phoenix, and still sort of really trying to work through the death of his father via ex-crewmember as well as that betrayal and the aftermath of how Blackbeard stole his father's special ability (like Marco being a phoenix) and could destroy the world with it (earthquakes).
Like Magneto, Marco is obsessed with revenge. He's spent several decades making his pirate crew famous for that so that any time someone around the world saw his tattoo/their pirate flag, they knew what it meant. However his father originally asked the crew not to hunt down Blackbeard, one did anyway, lost in the fight, got turned over to the marines and when the crew tried to rescue that one, that was when Blackbeard took advantage of the situation and killed Marco's Pops/Captain/father. Marco's still pretty big into the vengeance gig though and he doesn't regret the people he's killed at all.
Abilities?: Phoenix! Marco can turn into a blue fiery phoenix and he's one of the only zoan (animal type devil fruit user) to be able to control how much he turns into at a time. (just wings, just blue flames, individual parts of either human or phoenix etc.) The flames don't burn but they give him "limited regeneration" which is basically on par with Logan/Wolverine's. He's also strong, can fly, etc. He's weak to ocean & seastone which Marco would be unlikely to mention but could be pretty easily sensed. Not being able to swim is curse of all devil fruit & roughly the only way to kill Marco.
Anything he shouln't mention?: Never ever ever insult his father. Ace died defending Whitebeard's reputation and Marco *loves* his Dad to itty bitty pieces. Insulting Whitebeard would get even people he loves kicked through walls. Likewise insulting Ace would be a very bad idea.