Lots of good sub cards for your deck in this giveaway. Mainly Garnet, Hellhound, Walrus and Gorilla are the ones I have in my deck as subs in JP Dorapo. Not sure how viable the others are for sub cards, maybe someone else can fill me in on that one.
Let's see:
-Garnet, Hellhound, Walrus and Gorilla: Decent if you have nothing else and transition into great 35% Skill subs.
(Gorilla and Garnet are good choices if you have absolutely nothing. Gorilla by himself is pretty beast; a little more so when he gets his GOD evo.)
-Pinoko: Decent self-healer, heals status, and gives Status Immunity. Probably the best Blue healer you can get a while. GOD evo's a little better. Sub is alright.
Probably not a bad choice if you're lacking a healer.
-Mermaid, Harpy: They suck until they get their GOD evos and get Skill Lv6+. Even then, they're their own best subs mostly.
(Their Main Skills previous to Skill Lv6 are just straight Status; Lv6+ adds non-elemental attacks that have a high chance to inflict status assuming the enemy isn't immune.)
Buffalo, Coerul Wolf: Avoid at all costs. Everything else listed above is way better. Sub skills are crap.