Type project

Aqua, Fish and Sea Serpent - focus on Xyz Summoning.
Beast - focus on Synchro and, unfortunately, Link Summoning
Beast-Warrior - focus on using Continuous Spells as fodder for their effects or Summons, but mainly focus on Overdrive and Constellation Summons.
Cyberse - of course, Link Summons, and, not so obviously, Impure Summons.
Dinosaur - focus on Fusion Summoning (with a help for Proto-Fusion Monsters)
Dragon - focus on Crystal Summons
Fairy - focus on Exile Summon (which will get a retool soon)
Fiend - focus on Ritual Summoning (with help of Altar, Tandem and Rune Zone)
Insect - focus on alternative Fusion Summons (Contact and Transformation Summons a la Masked HERO)
Machine - focus on Enhance Summons
Plant - Synchro Summon specialists
Pyro - burn oriented, focusing on amassing a Graveyard load with Extremis Summons
Psychic - Chrono Summon specialists
Rock - focusing on Tribute Summoning and Lock Links (Links, but locking zones instead of freeing them)
Spellcaster - focus on Pendulums
Thunder - focus on Fusion Summons
Warrior - focus on various Summons
Winged Beast - focus on Genesis Summons
Wyrm - focus on Dark Synchro Summons
Zombie - focus on Action Summons (Main, Battle, Guard, and one mysterious)

(more coming soon)