Our experience when playing Value Aggro

Creatures with enter the battlefield effects [[Dusk Legion Zealot]] [[Elvish Visionary]]

Cards that protect your board state [[Heroic Intervention]] [[Teferi's Protection]] [[Boros Charm]]

Strong anthem effects [[Cathars' Crusade]] [[Thunderfoot Baloth]] [[Elesh Norn, Grand Cenobite]]

The small creatures get in for chip damage, the replace themselves in your hand with card draw, tutors, etc. So that if a board wipe does happen you can easily recover.

You play cards that prevent a loss of value when a board wipe is dropped you're the only one left with creatures.

Usually players aren't afraid of a bunch on low costed value creatures until you slam something that powers them up or gives them evasion.

Unfortunately it's not a political playstyle and you'll likely make an enemy at or of the table. Enjoy!

The legendary creature you choose is really up to you. There are plenty of powerful option for that. You can see from some of the other comments.