General

Okay, so I need some advice please

So I have 5 character slots in total (1 is a Cygnus Knight and 1 is a mihile.) I want to make a luminous. I need to know which other link skills is most important to have. I also have a Bucc, dark knight and shadower (lvl 155, 70, 101). Should I delete my shadower and dark knight? I don't ever play on them anymore so I could use the extra slots for link skills or a mechanic S card for buff duration. Which brings me to my other question. Does a luminous need a mechanic card or is it easily possible to get 100% stance at all times with just a mihile level 2 link skills? How much % buff duration does a mechanic give at level 100?

Thanks