2 cards that will Give both Destiny HEROs and Vision HERO's life.

Destiny HERO - Callerguy:

XYZ
Rank 4
DARK
Warrior-Type
ATK/2100
DEF/1600
You can detach 1 Xyz Material from this card; Add 1 "Destiny HERO" monster from your deck to your hand. If this card is sent to the graveyard: You can Special Summon 1 "Destiny HERO" monster from your Graveyard. You can only use each effect of "Destiny HERO - Callerguy" once per turn.

Nothing too crazy about this card, but it will work really nicely with Drillguy.
Summon Drillguy > Special Summon Decisionguy > Xyz Summon Callerguy > Detach Decisionguy > Search out whomever is best > End Phase add Decisionguy back to your hand.
Then if Callerguy is Destroyed, Special Summon Drillguy to Special Summon Decisionguy to then add back Callerguy to your hand at the end phase, or the destroyed Drillguy.
Destiny HEROs dont really have a turn 1 play and this would be good for them. Also an efficient way to search out the likes of Plasma or Dogma if they are gonna be your boss monsters.

Vision HERO Duos:

XYZ
Rank 4
DARK
Warrior-Type
ATK/2000
DEF/2500
2 Level 4 Monsters
You can Fusion Summon "HERO" Monsters using monsters from your hand or field and/or by shuffling monsters from your Graveyard into the deck. You can detach 1 Xyz Material from this card; Special Summon 1 of your banished "HERO" Monsters. If this card is used as a Fusion Material for a Fusion Summon: "HERO" monsters you control are unaffected by your opponents effects until the end of the turn.

This card could become pretty crazy, it would work nicely in Destiny HEROs with the likes of Celestial and Malicious Banishing a lot of your cards. And also quite good if you wanted to make a slower version of Masked HEROs as well as making the Vision HERO Fusions somewhat viable.
Let's say we open up Summoner Monk and a spell card.
Monk>Summon Vision HERO Vyon>Ditch Shadow Mist (now you can either search out a HERO if you wanted to, or wait to use his effect later) > Banish Shadow Mist to add Polymerization > Xyz Summon Vision HERO Duos > Detach Vyon to Special Summon Shadow Mist > Search out Mask Change > Fusion Summon Vision HERO Trinity with the Vyon in Grave the Shadow Mist on field and Duos, giving you a 5000ATK monster that can attack 3 times and is unaffected by your opponents card effects. (#GG) OR if you searched out Bubbleman instead of Mask Change you could go into Absolute Zero, if you already have one of the cards, you could then go into Acid to wipe their board. as both Zero and Acid would be unaffected by your opponents card effects.

The best thing is, you wouldn't really run Duos in Toadally HEROs so it's not like it's making it any better, as it would only work with Vyon, but it would just be so fun.

The second one seems really good,Ill check if I can do a Zoodiac Hero hybrid.

These aren't actual cards, but yeah

I think if Destiny HERO's were going to be any better they'd need more boss monsters, otherwise you're literally just relying on Destiny End Dragoon, and as he isn't a HERO monster he wont get the buff from Duos

Make 1 or 2 more Destiny HERO Xyz/Fusion monsters and you may have something there