Backtagging: Yes. Threadhopping: Threadjack away, Yuri sucks at technology. Fourthwalling: Um, your muse can try but chances are that Yuri will just think they're crazy. Offensive subjects: Shadow Hearts is actually one of those games that cover pretty much everything. Seriously. Offensive is what this game does. The only line I won't cross is rape.
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Hugging this character: He might punch them before they try depending on who it is. Kissing this character: If it's by a girl, he'd accept it. By a guy, taste his fist. Flirting with this character: Yes, flirt away. He will enjoy it from women and freak out if it's from men but it's totally a thing that happens in SH. Fighting with this character: Normally he's a basic hand-to-hand fighter but he has this ability to fuse with monsters - which means he becomes a monster. These monsters do have magical abilities. Let's not forget the god he has. Injuring this character: Yes. I will even do limb-loss for him if it's just a severing because Yuri can fuse them back on. Killing this character: Definitely, let's plot. Using telepathy/mind reading abilities on this character: God yes. His physical skills are great but his mental shields are non-existent. Yuri's had strange voices in his head that he listens to all the time. Abilities/Warnings: This is a good place to link a nice, fancy abilities post. Such as something similar to below:
Please list the characters (journals included) you play:
1) Assuming you read the full description of their abilities, may my character use [insert ability here] on your character?
2) If so, any special thing I/they should know about them?
3) My character is [kind of a jerk and will abuse their powers because lol, prone to losing control, etc]. Are you okay with this happening to yours?