1. As per the FAQ: "If a character carries multiple weapons, each weapon counts as 1 inventory slot." As the Arrow Guns function as a set weapon as they do not perform individually, two pieces of the sniper rifle form would count as 1 inventory slot. He can come with essentially one full round of ammunition and after that, you must obtain the magical reload item on the rewards page.
3. Just Xigbar on the taken list would be fine as they are considered the same person, with different canon points. Sora, Roxas, and Ven are considered different characters (Roxas, Sora, and Ventus are canonically different people), but Xigbar explicitly states that he had to change forms but it's still him. Of course if canon changes you may play accordingly, but for significant fan theories like that, it goes to canon-breaking fanon. To avoid spoilers, we would still just keep it as "Xigbar" on the taken list as that is the form you are applying for him as.
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"If a character carries multiple weapons, each weapon counts as 1 inventory slot." As the Arrow Guns function as a set weapon as they do not perform individually, two pieces of the sniper rifle form would count as 1 inventory slot. He can come with essentially one full round of ammunition and after that, you must obtain the magical reload item on the rewards page.
3. Just Xigbar on the taken list would be fine as they are considered the same person, with different canon points. Sora, Roxas, and Ven are considered different characters (Roxas, Sora, and Ventus are canonically different people), but Xigbar explicitly states that he had to change forms but it's still him. Of course if canon changes you may play accordingly, but for significant fan theories like that, it goes to canon-breaking fanon. To avoid spoilers, we would still just keep it as "Xigbar" on the taken list as that is the form you are applying for him as.