local function addCharacter(self, character, tile)
    self:insert(character)
    if tile and tile.Character == nil then
        if character.Tile then character.Tile.Character = nil end
        character.x, character.y = tile.xTile * size, tile.yTile * size
        character.Tile = tile
        tile.Character = character
    end
    return tile and tile.Character
end