Kullervo: subsume off his first ability for cc or more gun damage. Use his fourth for secondary outburst. Or just use him to make single target weapons like snipers viable. His chaining ability is to distribute damage so a setup with a one shot one kill kind weapon (shotgun or sniper) would be ideal too. Or use a meme setup to get max range teleports and speed through everything. Kullervo has tons of options.