Tridon is a monster 7* unit. He's got a bulky tank type LS (massive HP boost and also reduces all damage by 10%). His BB and SBB have a unique shield buff that have fixed HP values (2.5k for BB, 3K for the SBB shield) and adds some bulk to your units. His BB also gives a nice Heal over Time buff for three turns. His SBB gives a BC/HC drop rate buff and a +130% Defense buff for three turns as well.
Rize has the one of the highest damage multipliers on her SBB (850%). She's a pure nuker through and through. You want big numbers? She'll give you big numbers.
Both are solid units and well worth 7* let alone 6*. No need to rush them up until you have enough cost.
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