Defense Junior only goes on heavy armors.
Also, there's other enchants:
Assault (rank 9 suffix, enabled regardless)
Crit 8 increase when shooting rush rank 3+
Enabled on clothes, armors, hand hear and foot gear
Drops from: Carnivorous plant at ecology district, as a scroll
Rookie (rank c prefix)
Min damage 1~3 increase
When dual gun mastery rank B+, max damage 5~8 increase
Enabled on dual guns
Drops from: Rabbits from sulien ecology district, unspecified monster from heulwyn mines, both as a scroll
Camouflage (rank 9 suffix, enabled regardless)
When dual gun mastery rank 3+, max damage 3~9 increase
Enabled on clothes, armors, hand gears, and foot gears (seems like a decent replacement of back-breaking)
Drops from: Emeral Bison in Heulwyn mines (scroll)
Veteran (rank 9 prefix, enabled regardless)
When dual gun mastery rank 7+, min damage 2~5 increase
When closure rank 5+, max damage 5~10 increase
10% repair cost increase
Enabled on dual guns
Drops from: Emerald shrieker in Heulwyn mines (scroll)
Poacher's (rank 7 suffix, enabled regarless)
When Sulien ecology rank 3+, dex 8~15 increase
When Sulien ecology rank 5+, crit 15 increase
Luck 20 decrease (basically suffix version of vine)
Poisoned (?) sasquatch in sulien ecology district (scroll)
There's so much more that I don't think I'm gonna bother translating all, but here are the links to many other enchants not mentioned here:
http://mabinogi.inexeed.com/enchant/view.html?e_seq=721&eq=cGFnZT0z
http://mabinogi.inexeed.com/enchant/view.html?e_seq=709&eq=cGFnZT00
http://mabinogi.inexeed.com/enchant/view.html?e_seq=708&eq=cGFnZT00
http://mabinogi.inexeed.com/enchant/view.html?e_seq=701&eq=cGFnZT01
http://mabinogi.inexeed.com/enchant/view.html?e_seq=699&eq=cGFnZT01 (This one's for you, elves)
http://mabinogi.inexeed.com/enchant/view.html?e_seq=696&eq=cGFnZT01
http://mabinogi.inexeed.com/enchant/view.html?e_seq=695&eq=cGFnZT01
http://mabinogi.inexeed.com/enchant/view.html?e_seq=694&eq=cGFnZT01
http://mabinogi.inexeed.com/enchant/view.html?e_seq=722&eq=cGFnZT0z
http://mabinogi.inexeed.com/enchant/view.html?e_seq=724&eq=cGFnZT0z (Yes, it says Ensemble, but it's not the useless suffix that we have right now)
http://mabinogi.inexeed.com/enchant/view.html?e_seq=725&eq=cGFnZT0z
Maybe I'll just translate these links tomorrow