I agree with the advice so far.
Wilbur—He’s going to be a game changer on Titans and offense (selectively) for you, so I agree with doing him first. For the love of all that’s holy, DO NOT tank him on defense.
Why? There are a number of widely available S1 heroes that do the following:
Buffs—Kiril (Attack and Defense up)
—Wilbur casts his spirit link on the offense, but then Kiril fires and now the enemy has Spirit Link + Defense up. In the meantime, Wilbur’s defense up is partially negated by Kiril boosting the attack of the offense.
—Fast mana Sonya just takes the effects off anyway.
Defense Down: Isarnia, costume Gunnar, Grimm
—Okay, so now the whole team that Wilbur just linked gets defense down, or at least the front three. A combination of Kiril buffing the offense and someone else to Defense Down your Spirit Link defense is devastating to you.
***I’ll put it this way, anytime I see a Wilbur tank in a fight, I usually try NOT to kill him before he fires.
But, he’s great at everything else and will be great for you on offense as long as you pay attention to what the enemy team does (defense up, debuffers) and time firing him accordingly. You don’t want to fire Wilbur, for example, if a debuffer on the other side is about to go off within the next turn or two. You also want to be careful of D Down heroes on the other side.
I also agree with Scarlett as a second choice as she is great for titans, (895 ATTACK if you emblem her and go that path!) great for offense and sometimes useable as a defensive flank or wing with the right protection. Like Colen, she’s mega squishy (especially if you focus emblems on her attack) but she works well alongside of some of the green healer/minion tanks depending on who you have.
The attack down Scarlett gives enemies also kind of negates her squishiness as long as she fires before dying. I really like her, anyway.
On offense, Scarlett works extremely well with strong healing and basically any hero that gives Defense down, like Wilbur! Boldtusk + Wilbur + Scarlett + Colen would also make a devastating 4-1 red team in wars or on raids…as long as you can get the last two to live long enough. I’d go 4-1 with a second off-color healer for that team.