Team Making

Hi Guys! I'm trying to build 4 main teams for my El Chronicle Game.

Can you help me which of these heroes have the best synergy?

Here are the list of my collected heroes that I'm trying to build:

Tanks: Dean, Richard, Mubu (not yet acquired), AhkChungwan (not yet acquired)

Semi Tanks: Grace, Irene, Iri, Kael (not yet acquired)

Support: LeeJiyeon, Aaren, YeryungSuhwa, Yeonhwa (not yet acquired)

Specialists: Scarlett, Maeho, Claire, Not Decided Yet

Assassins: Gwen, MaSeoLin, Lily, Jade

My first team is (Since I have build them the most, all are 5 stars) are:

Tank: Dean

Semi Tank: Grace / Irene

Support: LeeJiyeon

Specialist: Scarlett

Assassin (If needed): Gwen

Most of the time I go for 1 tank, 2 semi tanks, 1 support, 1 specialist.

when I'm going to use an assassin, I get rid either a semi tank or a specialist from the team.

What are your team recommendations?