Good job on this chapter some ideas for technology you could use is the fast travel new u system from borderlands you could probably get it from Handsome Jack or some hyperion engineer maybe the helios moonbase or any guns from that franchise

Since gohan messed with the time line by a lot does that mean he's going to be joining the time patrol and are there going to be arc for time patrol

An idea if you ever want him to be able to travel to the DC universe or any other universe is that you could have him look for the siege perilous and have cyttorak modify it to travel to different universe.

Phase Shift (unoridnary), Creation and Danger sense these will probably be most beneficial for him to use.