Jemma
Jemma is much like he was in Lupin III: Densetsu no Hihou o Oe!/Level 8, but now he's much tougher. He can now shoot bullets from his eyes and fire his fists at you. Nevertheless, the basic strategy is the same. You'll want to try to get him in a corner, since it's tough to take him out from a distance, but you will get hit a lot.
Ending
Which ending you get depends on whether or not you got the cutscenes in Lupin III: Densetsu no Hihou o Oe!/Level 11A and in Lupin III: Densetsu no Hihou o Oe!/Level 13. Thus, there are four possible endings:
- If you missed both cutscenes
- If you got only the Level 11A cutscene
- If you got only the Level 13 cutscene
- If you got both cutscenes
None of these endings is clearly the "best" ending, though the endings you get with the level 11A and 13 cutscenes are longer.
If you don't want to play through the game four times, you can see most of what there is to see by missing both cutscenes and then playing through it again while getting both cutscenes. (You can also use a password to skip to level 14 with the desired ending already set up for you. Or if you don't want to cheat that much, you can of course use the level 10 password to start at the point where the game first branches.)