I just want to confirm, how does getting buffs from other players in raids work?

It seems to be from other player's souls only but does that also include all skills / extra skill? Don't think I've ever seen myself get HP regen from anyone for example.


Also a a F2P player would it be a sensible idea to make my main party Light?
I have Sol and Raphael as SSRs (and Wind Gaia) but I never really heard anyone say anything great about Raphael.