The skydiving question is answered on the EASA Website.
Can I fly an aeroplane for commercial parachute dropping operation with my PPL (A)?
Answer
Parachute dropping - Reference: Reg. (EU) No 965/2012 on air operations: Art. 6(4a); Regulation (EU) No 1178/2011 on Aircrew: Art. 3(2) The holder of an LAPL or a PPL may conduct parachute-dropping flights, only if the conditions stipulated in Art 6 (4a) of Reg. (EU) No 965/2012 are met. In all other cases, only pilots who hold at least a CPL can conduct SPO flights in accordance with Part-SPO.
A useful link to towing gliders here:
https://tugpilots.co.uk/pilots/requirements/
Banner towing requires a banner towing rating in accordance with FCL.805, but not a CPL.