Out of my five chars the only char he probably won't be able to read much regarding body language, expressions and such is Mammon, mostly due how it covers its face and always wears blank long cloaks. In fact Mammon is such a mystery that even its gender is unknown, though for personal preference I use female pronouns I do try to play it asexually.
Regarding the rest, Ikki is the second most closed off one, though unlike with Mammon his distance probably tells lots of him. Shikamaru is free to pick up the most obvious things for perceptive people, like that there's a lot of anger and hate in him but none of it seems directed to something in special or in general. He's also free to notice that despite being not very talkative and distant he doesn't push off people actively until he's really fed up with them. Honestly it's hard to say what Shikamaru can deduce from Ikki in general just from observation, it also depends on how much Shikamaru wants to bother thinking about it with. Oh, and currently Ikki is working on a non-journal basis, because he ignores it and doesn't even know in which corner of his apartment it is.
The other three are pretty open, though Boa Hancock's body language isn't an honest one so Shikamaru may not be able to find out much about her real self just from it. Similar thing happens with Luka, she's an android but that can't be noticed just by general observation.
Can he hack their filters?
As I said Ikki doesn't wotk with a journal so for now this gets a N/A from him.
Regarding the others, only Mammon and Luka can do 100% filters, those things are usually noted, if not assume they aren't 100% anyway. Shikamaru is free to hack but don't expect my chars to appreciate it if they find out about it.
Can he use Kagemane no Jutsu on them?
All my chars have perfectly working shadows. Except Mammon, who is a special case as it is a high class physic and uses illusions with great ease, so Shikamaru may very well be trapped in an illusion and be trying to control a mailbox basically. Though that would be talked before hand, anyway for theory and starters, yes, he can.
If yes, what is he allowed to do?
Anything and everything, honestly I can't think of anything he couldn't do.
How strong is this character?
From the strongest to the weakest physically: Ikki - Boa Hancock - Luka - Keiichi - Mammon
Ikki and Boa are very strong. The other three are mostly human possible strength except that Luka's skeleton is made of a special metal alloy so even if her strength isn't much it would still hurt if she slapped him. But regarding the hold of the Kagemane the only ones who would give Shikamaru a lot of problems would be Ikki and Boa. Specially Ikki.
Anything else?
Not much. Mammon is a telepath too but that rarely pops around because it prefers to not use it, if it ever came to want to use it I would discuss it first so no worries there. Oh, Ikki has a permissions post here, nothing great but it would make things easier for me if you could check it. In advance I'll say that I don't think that Cosmos influences much on Naruto's ninja jutsu's
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Fandom: (in the same order) Vocaloid, Katekyo Hitman Reborn, One Piece, Higurashi no Naku Koro ni, Saint Seiya
What can Shikamaru learn about this character?
Out of my five chars the only char he probably won't be able to read much regarding body language, expressions and such is Mammon, mostly due how it covers its face and always wears blank long cloaks. In fact Mammon is such a mystery that even its gender is unknown, though for personal preference I use female pronouns I do try to play it asexually.
Regarding the rest, Ikki is the second most closed off one, though unlike with Mammon his distance probably tells lots of him. Shikamaru is free to pick up the most obvious things for perceptive people, like that there's a lot of anger and hate in him but none of it seems directed to something in special or in general. He's also free to notice that despite being not very talkative and distant he doesn't push off people actively until he's really fed up with them. Honestly it's hard to say what Shikamaru can deduce from Ikki in general just from observation, it also depends on how much Shikamaru wants to bother thinking about it with. Oh, and currently Ikki is working on a non-journal basis, because he ignores it and doesn't even know in which corner of his apartment it is.
The other three are pretty open, though Boa Hancock's body language isn't an honest one so Shikamaru may not be able to find out much about her real self just from it. Similar thing happens with Luka, she's an android but that can't be noticed just by general observation.
Can he hack their filters?
As I said Ikki doesn't wotk with a journal so for now this gets a N/A from him.
Regarding the others, only Mammon and Luka can do 100% filters, those things are usually noted, if not assume they aren't 100% anyway. Shikamaru is free to hack but don't expect my chars to appreciate it if they find out about it.
Can he use Kagemane no Jutsu on them?
All my chars have perfectly working shadows. Except Mammon, who is a special case as it is a high class physic and uses illusions with great ease, so Shikamaru may very well be trapped in an illusion and be trying to control a mailbox basically. Though that would be talked before hand, anyway for theory and starters, yes, he can.
If yes, what is he allowed to do?
Anything and everything, honestly I can't think of anything he couldn't do.
How strong is this character?
From the strongest to the weakest physically: Ikki - Boa Hancock - Luka - Keiichi - Mammon
Ikki and Boa are very strong. The other three are mostly human possible strength except that Luka's skeleton is made of a special metal alloy so even if her strength isn't much it would still hurt if she slapped him. But regarding the hold of the Kagemane the only ones who would give Shikamaru a lot of problems would be Ikki and Boa. Specially Ikki.
Anything else?
Not much. Mammon is a telepath too but that rarely pops around because it prefers to not use it, if it ever came to want to use it I would discuss it first so no worries there. Oh, Ikki has a permissions post here, nothing great but it would make things easier for me if you could check it. In advance I'll say that I don't think that Cosmos influences much on Naruto's ninja jutsu's