Laevatain 
Wulfgard 
Akekuri 
Ardelia
This team uses multiple Heat characters to apply Heat Inflictions for Laevatain and Ardelia for Sustain and Nature Infliction, enabling Combustion and Corrosion triggers for Laevatain Combo Skill. Akekuri also helps with SP generation on her Combo Skill and Ultimate.
Keep in mind that depending on her Gear Set you should trigger Combustion using Laevatain in order to benefit from Gear Set Effects.
Laevatain Wulfgard Akekuri 
Antal
Another version of the team that uses Antal for slightly stronger buffs (Heat Amp and Heat Susceptibility), but much lower Sustain.
Laevatain Wulfgard Akekuri 
Gilberta
This variation uses Gilberta for grouping and is recommended when dealing with multiple enemies at the same time.