Hello Yoonnetuerr88
When I get a day pass with a half-fare card and get a companion ticket for my friend, do I need to get them a day pass as well?
No, the companion ticket is their ticket. What would be the purpose of a companion ticket if they were required to have another ticket?
Also, for the part when we are not travelling together (we will meet at a middle point first), can my friend still use the companion ticket, or does he need to get a full ticket for that ride?
No, this is not possible. The companion ticket is solely valid if the person who holds the day pass is physically travelling together with the person using the companion ticket. If you meet at a later point, the people travelling with a companion ticket need another full fare ticket to the place where you will finally meet. The companion ticket is not a standalone ticket and therefore, without another person with a day pass or GA, not valid as a ticket for travel.
Kind regards,
Roland